I went for Alpinestars when I was looking last year - got mine at MCA in Leicester, and there was also a place in Southend who seemed to be reasonably priced - can't remember who sold what though....
Wolf make a decent set of leathers.Were some kangaroo sets on fleabay for £400,Cissbury Leathers were one seller. RST are they British?, always been cheap,but Andrew Pitt,Whitham wear them,could be a good buy.
Remember its almost the end of the season, so bargain time is coming soon, with the London Bike show being the best place for bargains. It used to be at Ally Pally but is moving down to the Exel centre so they can have more space !