AG Barr has released the limited edition IRN-BRU 1901 in shops across Scotland.

The top-end tipple has been made using an ‘old and unimproved’ IRN-BRU recipe first created in 1901, when BRU was born.

“This is IRN-BRU as you’ve never tasted it. It’s a chance to enjoy a unique and authentic piece of Scottish history – but don’t hang about, we don’t think it will be around for long,” said Robin Barr, former chairman who unearthed the recipe.

“The 1901 recipe has aged beautifully over the last 118 years. For a limited time, we’ll be producing a premium ‘old and unimproved’ IRN-BRU 1901 just as it was enjoyed by our first fans.”

While IRN-BRU’s secret flavour essence remains unchanged, the 1901 recipe doesn’t have any caffeine, but it does have a frothy head on its gingery fizz and is sweetened with sugar to produce a rich satisfying taste.

The new limited-edition packaging features the IRN-BRU strongman and authentication from inventor Andrew Greig Barr in homage to its Victorian-era advertising. Andrew oversaw the launch of Barr’s IRON BREW in 1901, which was later renamed IRN-BRU.

IRN-BRU 1901 retails at £1.99 a bottle. It will be sold only in 75cl glass bottles, just as it was back in the day.