If you're working at one of the centres or NATS premiere airports EGLL, EGKK then Prospect will work wonders for you, if you work at one of the regional airports as I guess you will be then forget it as they're just not interested.
I've been a great believer in the union ethic all my life and foolishly believed that this one would represent my interests, but I like many of my colleagues at the airports found out that Prospect just don't care and don't like it if you try and stand up for yourself and demand fair representation 'cos when you do you're deemed to be "hostile" and they don't like people standing up for themselves.
That's my opinion and I resigned from the union because of it, maybe things will change and I'll rejoin but I doubt it.