Comic book tycoon Mark Millar downed a nine-year- old can of Irn-Bru after finding a stash in his cellar.

Millar, 51, was delighted to discover a batch of original recipe Irn-Bru after revealing he had stopped drinking it when the secret recipe changed.

The creator of movies Kick-Ass and Kingsman tweeted: “Just found 23 cans of original formula Irn Bru when we were cleaning out the cellar.

"The catch? They’re NINE yEARS OLD! Do I still DRINK THEM????”

After fans encouraged him, he announced: “Right. I’m drinking these cans. I’ll let you know how it goes.”

Millar added: “Just drunk one.

"It tasted like water with large metal grains, but I persisted and finished one can as I PAID for these nine years back.”