The campaign from Walkers crisps offering consumers the chance to win £10 if they could correctly guess where in the country it would rain, has been banned by the Advertising Standards Authority (ASA).
The campaign received a complaint from a consumer who had purchased a sufficient number of crisps to enter the promotion twice a day, but was later informed that the number of entries had been reduced to one-per-day-per-person.
This saw the complainant challenge the fairness of the promotion.
Walkers Snack Food responded to the claim, saying that it took the decision to reduce the number of plays per day due to the level of demand outstripping the number of different areas across the UK and Ireland where they could choose.
The company also claimed that it made every effort to ensure that its change of rules was widely communicated, including the use of its Facebook page to direct and respond to enquiries and that they believed the promotion was conducted fairly.
However the ASA upheld the complaint and ruled that the campaign should not run again in its current form.