In reply to arnott70536:
To be honest, once you've got a harness, helmet, rope, quickdraws and shoes, getting a set of nuts (about £60) and three cams (about £100 if you look out for special offers, and not strictly necessary anyway) isn't that much extra cost. And if you get into climbing outdoors by joining a club then you'll probably be able to borrow other peoples' stuff for a while anyway.
It's worth it, because the easy trad climbing in the UK is a whole world more fun and interesting and varied and spectacular than the easy sport climbing...