A competition run by Brewdog which said customers could win a solid gold beer can was found to be misleading by the advertising watchdog.

The ads, which ran on Twitter and Facebook, told customers that 10 24 carat solid gold cans worth £15,000 were hidden inside packs of Punk IPA and Hazy Jane beer.

After receiving 25 complaints, the Advertising Standards Agency reviewed the competition and found the prize actually consisted of 24 carat gold-plated replica cans.

The watchdog also found Brewdog never had a valuation of the cans, and at the time of the review, solid gold cans would be worth around half a million dollars rather than £15,000.

“The awarded prize was not the same as that described in the ads, the promotion caused unnecessary disappointment to participants and therefore breached the Code,” said the ASA.

The ASA rules the advert must not appear again in its current form.

Since the competition launched, Brewdog has dropped the use of the world “solid” in its advertising.

CEO James Watt said: “We messed up our first gold can promotion. So, we have done 2 things: 1) Offered all of the winners from the first round the cash equivalent.

“2) Launched a new gold can competition with clear T&C’s & a cash equivalent included from the outset.”

Brewdog had another advert banned in July after it came under fire for promoting an alcoholic drink as healthy.

The ad read: "Due to advertising regulations we cannot claim this drink is healthy," and continued: "Even though Clean & Press is only 90 calories per can, with no carbs or sugar and a little bit of alcohol, this is not a health drink. If you are looking for a health drink, do not drink Clean & Press."

The Advertising Standards Authority (ASA) said “only 90 calories per can” and “no carbs or sugar” were nutrition claims that were not permitted for alcoholic drinks, as was the implication that the product was beneficial to overall good health or health-related wellbeing.