Just the one (used to be in the 'British Cyclo-Cross Asociation' too)
Nowadays, I'm just in it, for 'ease'
Plus, tight-fistedness................................
I was asked, for a while, to join Wakefield Triathlon Club, but (apart from the quite substantial membership fee), that would have meant buying new kit, for ride & run, I wouldn't have been doing the wet bits
Whereas, I already have Club shorts, long-sleeve jerseys, short-sleeve jerseys
Unlike other local Clubs (like 'Calder Clarion') they don't offer other clothing, thus, it's far more prudent to just pay the £10 year for the existing Club
(I arrange my own 'British Cycling' membership, & have just renewed this morning)
Likwise, I also have a running club membership,, I have vests, 'technical' t-shirts, & warm-up jackets in their colours (more waste)
Granted, their subs are less, £25, as it includes English Athletics membership
Both Clubs in signature
(also a member of the 'Fell Runners Association')