The UK advertising watchdog has issued a further warning to Coca-Cola Great Britain over its controversial adverts for the Oasis drink.

The soft drinks giant has been told not to use three poster adverts featuring a young woman embracing a green man covered in cactus spikes, following complaints that the woman looked under the age of 16.

It is the latest warning for Coca-Cola GB over the advert campaign, which was last month ordered off television screens by the Advertising Standards Authority (ASA).

In the tv ads, the girl is shown running off with the "Cactus Kid" after falling pregnant by him. The poster ads continued the theme, asking readers to visit a website to "decide the fate of Cactus Kid".

Coca-Cola, in its defence, denied that the adverts "sexualised children" and that no complaints had been registered at its helpdesk. The woman, it added, "was conceived as a 20-year-old young woman and the actual age of the actress was 22".

The ASA said of the poster campaign: "We considered that her youthful appearance meant many people were likely to see her as a girl in her early teens.  We also considered that "Cactus Boy" was likely to be seen as an adult man."

It added that, when the posters were placed alongside the previous tv campaign, the story suggested "a minor was in a sexual relationship with an adult man".