www.revolution-motorstore.co.uk
They're in Gateshead, and from the website look like a pretty sweet supplier. I have no idea about anyone in Crawley, although I'm sure there should be some, if you check out mags like Max Power (look at me being Mr Boy Racer Chav Geek again
)
For anyone near me in the West Yorkshire area, may I recommend madmotors.co.uk, who have been extremely helpful in sourcing American parts for my Civic.