Less people go clubbing in general, hence there are less clubs. People got tired of ever rising drinks and entry prices, and getting groped or punched.
Clubs are still popular but younger people would much rather go to comedy gigs, see bands, festivals and go to cocktail bars or home than line up in pastel coloured Ben Sherman shirts and straps dresses outside the empire in the rain.
They do better in bigger cities but in places like boro there are only a few left, can only think of empire, spencleys upstairs, dickens in gold room which is largely events only now I think, flairs/popworld, purple onion downstairs maybe? Prob a few others kicking about; but used to be loads. Think only one place for the gay scene at sapphires which used to be Rooney's. Used to
Be Cassidy, Annie's bar and Tiny at various times that I know of. You go to places like Leeds and there is an entire gay friendly area, on top of vibrant nightlife but it's a much bigger place.