Problem with most airfields in UK is that they're privately owned and not owned by the local Chamber of Commerce as they are in USA and France where fees are either much lower of non-existent.
And another problem is that most UK pilots don't really care or there's not enough of beef in the representative groups to make a significant difference.
Otherwise a vicious battle would have been fought many decades ago and the airfields wouldn't have been privately owned and completely unregulated in how they decide to charge their users.