I still think they're acting illegally personally. The Equality Act states that you can't disadvantage a group of people who share the same characteristics (in this case anybody who isn't Polish) which is clearly the case here as anybody who isn't Polish has to pay more to attend the same game. On the other hand, the positive action provision allows you to take action if a group of people are underrepresented in a particular activity, which I suppose is the argument they're taking. However, for that to occur, the group in question has to have a disadvantage that the positive action is designed to overcome. I can't see that there's anything stopping the average Pole from attending Bath City games, the same as anybody else.