It does appear that not only does the club have to be afilliated but also the individuals have to be members (affiliated) as well and for every 50 members you get 1 marathon place. Currently my running club is affiliated with UKA but none of the runners so this is being looked into. 200+ runners and no marathon slots :o(
I'm club secretary for my running club and previously membership secretary, so please let me shine a light so to speak.
Your club currently pays £50 per annum for the club to be registered under UKA. Each individual member pays an annual fee to your club, your secretary who looks after the membership will take an annual fee from each runner with £5 (£10 for 2013 onwards) going direct to UKA.
This £5 to UKA provides insurance and allows you to typically have a £2 discount to any races you enter.
I struggle to understand why your club has 200+ runners but have not registered you to UKA!!! Thats what the fees are for as well as the remainder going towards the running of the club.