Across Wales, there are roads, town centres, attractions, buildings, universities and more that have benefited from EU cash to help poorer regions catch up.
Since the UK left the EU on December 31, people with an interest in Wales' more deprived regions have been waiting to find out how the Westminster government will fulfil its promise to ensure that this funding is replaced and our neediest communities do not become a casualty of Brexit.
So far, the furious row over who will get a say in how any such money is spent has seemed to mask the fact we still don't know the answer to simple questions like how much money will there be; how will it be allocated, which areas will be eligible, what will the criteria be for awarding cash, what will the bidding process look like.
The Treasury has indicated that Chancellor Rishi Sunak will give more clarity in the Budget this week. And there will be a lot of questions he needs to answer.
What have our poorest communities been promised?
The UK government has committed itself to launching two separate funds to redistribute infrastructure spending to our most deprived communities.
Firstly, Westminster has promised to set up a Shared Prosperity Fund for communities and charities - targeting industrial areas, deprived towns and rural and coastal communities, and “help to level up and create opportunity across the UK for people and places.
A Treasury document last year suggested that this would be worth an average of £1.5bn a year and it has previously described this as a direct replacement for EU structural funds.
In it's 2019 election manifesto, the Conservatives pledged that this fund would “at a minimum match the size of [Structural] funds in each nation”.
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Its aim is to "level up and create opportunity across the UK for people and places" and will be operated across the UK under the powers in the UK Internal Market Bill. This were passed last year and granted the UK government new spending powers in areas that are otherwise devolved, such as powers to spend on infrastructure and cultural and educational facilities.
But that's about all we know so far. The Treasury said: "The government will set out further details in a UK-wide investment framework in the spring and confirm multiyear funding profiles at the next Spending Review."
On Wednesday last week, the Treasury also announced details of a "levelling up" £4.8bn pot of cash for deprived areas of Wales, Scotland, Northern Ireland and England.
This hasn't directly been linked to replacing EU funding but appears to be set to be targeted at the same objective.
The idea behind this pot of money - around £4.8bn - is to use it to reduce inequalities between communities across the four nations of the UK.
After the Tories won the 2019 election, they set up a taskforce to reduce regional inequality with a so-called "levelling up" agenda. This says those areas that have seen the lowest growth in earnings, should see earnings rise faster than they have in recent years; areas with the worst unemployment rate should converge with the national average; and areas with the lowest employment rate should also catch up with the national average.
Using the Barnett formula to divide the Levelling Up Fund between each home nation, it initially awarded £4bn for England and extended this to provide an extra £800m for Wales, Scotland and Northern Ireland.
But unlike with the previous EU funds, when each devolved government controlled how the money was spent, the UK Government has said it will run the fund for all four UK nations rather than hand any extra cash directly to the devolved governments.
The Levelling Up Fund will supersede existing local growth funding streams, such as the Local Growth Fund, Pinch Points Fund, and future rounds of the Towns Fund.
Again, there are still no details about exactly how this £800m will be divided up between the three smaller home nations and how projects can make a bid for the money.
The government has said the cash will be earmarked for investment in town centre and high street regeneration, local transport, cultural and heritage projects. It will publish a prospectus for the fund and launch the first round of competitions in 2021.
The new fund will invest in local projects worth up to £20m. This includes bypasses and other local road schemes, bus lanes, railway station upgrades, regenerating eyesores, upgrading town centres and community infrastructure, and local arts and culture.
The Fund will be managed jointly between the Treasury, the Department for Transport and the Ministry of Housing, Communities and Local Government.
How much will Wales get?
This as yet has been unanswered. The Conservative manifesto commitment would indicate that Wales would receive at least as much as it would have received through EU structural funds.
But it has not been confirmed if Wales will receive a Barnett formula style consequential of money being spent in England for all of the funding - or whether money will be allocated on the basis of need across the UK, in which case Wales is likely to be entitled to a greater share of the cash.
When will we find out answers?
Pretty much every fund announced by the Treasury comes with the caveat that further details will be released in early 2021. With the budget due on Wednesday, it seems we will finally hear more details about the finer points of the post-Brexit funding this week.
Ahead of the budget, a spokesperson for the Treasury said: "Further details on how the [levelling up] fund will operate will be published in the prospectus at Budget – including who can bid, the types of projects eligible for funding, and the criteria for assessing proposals."
Why is this so controversial?
All of these announcements have been obscured by a row between Wales and Westminster over who will get to spend the money.
The Welsh Government played a core role in spending EU structural funds in Wales and has a strategy in place for how any replacement funds should be spent.
There has however been anger in Cardiff Bay and in Edinburgh at the suggestion the UK Government will bypass the devolved administrations and work directly with local authorities and other partners to distribute funds in future.
In a joint statement last week, two Welsh Government ministers Jeremy Miles MS, and Rebecca Evans MS, accused the UK government of a snub to devolution.
Referring to the £4.8bn levelling up fund, they said: "This is the UK Government taking funding that would previously have been allocated to Wales to spend in line with the priorities this Senedd has identified.
"This means decisions made by Whitehall departments with no history of delivering projects within Wales, no record of working with communities in Wales and no understanding of the priorities of those communities. In practice, this will mean that the UK Government is taking decisions on devolved matters in Wales without being answerable to the Senedd on behalf of the people of Wales."
They said that the fund might mean as little as £50m a year for Wales.
In response, Tory MPs have hit back at the Welsh Government saying it had thrown in its lot "with the nationalists".
Preseli Pembrokeshire MP Stephen Crabb said: "When I hear Welsh Labour politicians talk down, devalue the efforts of the United Kingdom, when I hear them wanting to stop UK government actually spending money on projects in Wales, when I hear them cynically stoke up the rhetoric around the English-Welsh border, and when I hear them criticise and delegitimise visits to Wales of the UK prime minister - I fear that they've turned their backs on the union and thrown their lot in with the nationalists."
Welsh Secretary Simon Hart said the fund represents "significant investment in Wales and is testament to our determination to level up the whole of the UK", the Welsh Government has accused the UK Government of undermining devolution.
But a Welsh Government spokesman said: "This isn't new or additional money. This is the UK Government aggressively undermining the outcome of two referendums which backed Welsh devolution.
"The UK Government was not elected to take decisions or spend money in areas that are devolved to Wales.
"It is also an example of the unconstitutional Internal Market legislation, which was rejected by the Senedd, being used to stop decisions about Wales being taken in Wales."
How did EU funds work?
Before Brexit, the money that came to Wales from the EU was split into three broad categories:
The CAP and the structural funds for economic development were pre-allocated funds which were agreed at the outset of the EU’s seven year budget cycle (the multi-annual finance framework (MFF).
There were also competitive funds, e.g. Horizon 2020 and Erasmus+, which involved competitive bidding for funding against other projects across the EU.
Wales received EU Structural Funds to support economic development - such as infrastructure, businesses and skills - with poorer regions receiving greater investment. Examples of where this money was spent in Wales include colleges and roads, such as the Heads of the Valleys.
With higher levels of economic deprivation, Wales received five times more in funding per person than England between 2014 and 2020. This funding came to an end on December 31
What about other EU funds?
Common Agricultural Policy
CAP funds allocated to member states and are then distributed within the member state. It gets the money under the EU Regional Policy, which aims to reduce economic disparities between the EU's regions. There are two "pillars" to the CAP: the European Agricultural Guarantee Fund, which supports farmers’ incomes in the form of direct payments and market-support measures according to the regulations set by the EU; and the European Agricultural Rural Development Fund, which provides more flexible support to promote development objectives in rural areas.
The EU subsidies - which have amounted to around £350m a year - make up more than 80% of farm incomes in Wales on average. The vast majority of cash was given to farmers as so-called "direct payments", under the Basic Payment Scheme.
The vote to leave the EU prompted a review of the subsidy, which Rural Affairs Secretary Lesley Griffiths has said made Welsh farms uncompetitive. The UK Government has pledged to maintain the “same cash funds” of support for farmers (as they receive under the CAP) until the UK general 2022 election.
What system will be in place beyond that is as yet unclear – although a transition period involving some direct payments is expected to last until at least 2024, and the UK government has stated that future payments to farmers will be based on their contribution “public goods”, most notably environmental enhancement.
It has also stated that it will work with the devolved governments to ensure the overall framework for funding to replace the CAP “works for the whole of the UK”.
Before Brexit, Wales could also tap into pre-allocated investment funds including the Youth Employment Initiative (YEI) and the European Maritime and Fisheries Fund (EMFF), which promote labour-market outcomes for under 25-year-olds and support fishing communities, respectively.
We could also access programmes including Horizon 2020 (H2020) which has a budget of €77 billion for science and research projects, the Connecting Europe Facility with a €22 billion budget and the Erasmus+ scheme worth €15 billion.
The UK left the Erasmus scheme as part of Brexit, meaning Scotland, England and Wales can no longer participate. In its place, the UK Government launched the £110 million Turing scheme, which will support UK students to go on work and study placements abroad from September.
The 1,246 page-long Brexit agreement says the the UK can continue to pay into and participate in five EU funding programmes – including the big Horizon Europe research scheme, a seven-year, €95.5 billion plan which will succeed the current programme, Horizon 2020. However, things will get trickier as UK will have to endure further negotiations with Brussels to formally “associate” with the programme, meaning London will contribute some funding and its researchers can bid for Horizon money alongside Europeans.