"The formula effect generally, and particularly in the case of clothing, is dependent not just on the choice of index but also on the characteristics of the price movements and levels being measured, sample design, choice of base period and price collection methods, " said its spokeswoman Jill Leyland.

BBC: Inflation: No change to RPI calculation

Out of a sample of over 2, 000 fans, 9% said they would not be renewing their season tickets regardless of price, with 7% set to renew if the price does not increase and 13% yet to decide.

CNN: Big-spending Man City top Premier League value table