Preston had to drop their prices a couple of times this season because the away clubs objected. From memory they were operating a membership scheme which then allowed home fans a discount price, which of course they can't offer to home fans. They are not allowed to charge away fans anymore than the equivalent view as the home fans. The rules are a bit flakier when it comes to special days which clubs usually have 2 or 3 times a season.
Stanley get round the rules every home match
