Dr Hilary Jones has warned Good Morning Britain viewers that breaking coronavirus lockdown rules for the Easter sunshine could have a "detrimental" impact.
The UK, like many countries around the world, is currently on lockdown in a bid to stop the spread of COVID-19.
As of Wednesday evening, it was confirmed there were over 60,000 positive cases of the virus in the UK, with over 7,000 people sadly dying.
The government have placed restrictions across the country to stop people making unnecessary travel and trips out of the house.
But while people are allowed to make essential shopping trips and have an hour of outdoor exercise a day, a minority of the public are defying the rules and measures put in place.
Dr Hilary took aim at the "selfish" individuals, warning their actions were not helping anyone, especially the NHS.
Nurses, doctors and other NHS staff members, not to mention other key workers, are risking their lives daily for others.
This hasn't stopped many people taking to beaches, parks and other public places to enjoy the sunshine though - with many of these places packed.
But with a new mini heatwave heading our way in the coming days, Dr Hilary has asked that people adhere to the rules and simply stay at home.
He warned that lockdown could go on for longer if the rules continue to be broken, while also stating that said individuals were not helping stop the spread.
Host Susanna Reid pointed out: "If we're gonna keep spaces open, if we're gonna get through this with our health intact we need to just stick by the rules."
Hilary agreed: "Yeah, I mean the guidelines are really based on evidence and logic, and if we're to help the NHS workers that we we're all coming out Thursday night to clap for who are really gonna make a difference to people losing their lives, then we need to stick by the rules and that means everybody.
"There is this mentality that the rules apply to everyone else for some people, but actually everyone needs to do their bit."
He added: "Everybody can adhere by the rules and actually this will make a difference, and it will cut down virus transmission and it will get us out of lockdown quicker than would otherwise happen."
Hilary went on to admit there's "no point" putting a deadline date on lockdown as it would all depend on cases, deaths and even people stopping the spread by sticking to the measures in place, with host Ben Shephard agreeing with this.
Dr Hilary then appealed to those ignoring the advice ahead of the warm weather, and begged people not to be "selfish".
He explained: "It's crazy, this kind of mentality of are we nearly there yet, applying it to lockdown is really not helpful.
"We need to know we have to stay disciplined as a group of people, as a society in order to make a difference to this. [An end to]lockdown will happen in time but it's so important.
"I know the weather is gonna be good, it's gonna be decent this weekend, but it doesn't matter you know?
"That could be detrimental to what is going on right now and we'd be wasting all the good work done by the majority of people, and I appeal to the minority please do adhere to the rules because it makes a big difference.
"Don't be selfish, look after everybody else."
Good Morning Britain airs weekdays at 6am on ITV.