I was a Friend but haven't received any newsletters lately, so I assume my membership has lapsed. (Can't remember if I set up a standing order or not, and haven't got round to checking with their membership secretary.) Didn't receive a renewal reminder - perhaps that's why their membership has been dropping!
I don't fall into the retired middle-class category and don't recall off-hand what the Friends' organised activities were. Daytime week-day trips and classical music concerts?
One of the problems with voluntary organisations is that they're run by people who have the time to do so, and that often means they're retired or can afford not to be in full-time employment (ie affluent/middle class). That often includes the members too, so the events etc are geared to suit them and their interests (hence daytime week-day events which are ill-suited to people who are at work) which is likely to attract like-minded new members, and so it goes on. A voluntary organisation's output will reflect the interests and capabilities of its active members so if you're dissatisfied with an organisation then become an active member and try to broaden their output ? they?d probably welcome you with open arms!