Kerry Foods has been forced to reschedule an advert for its Mattessons Fridge Raiders product to a later airing time after it was found to upset younger viewers.

The Advertising Standards Authority upheld complaints from 23 viewers who reported that children aged between 11 months and eight years had been disturbed by the ad for the chicken snacks, which takes a lighthearted vampire theme.

The advertisement features a man at a bus stop eating the product unaware that the mouths of people around him, including an elderly woman and a child in a pushchair as well as a passing bus-load of people, are being contorted to bear vampire-like fangs. They advance towards him with their teeth bared and only return to normal when the man looks up.

It will now be shown after 7pm. Further complaints about the morphing techniques used in the advert were not upheld by the ASA.