I like it and I'm happy to add:
ECU
Weber: great product, shit support, only "approved" dealers have the software and will not share
VEMS: great product, fantastic support, purchased from
rob@vems.co.uk website vems.co.uk
(I should be on commission for recommending them

, although it was Werner who pointed me in their direction)
Springs
Merlin Motorsport (castle combe) usually caries a very good selection at sensible prices
Harnesses
Luke aero-style release will pass SVA and are EC approved, although don't deal with Luke direct as service sucks.
Custom inlet manifold
Boggbros.co.uk exceptional quality but when they say 8 week wait they mean 10-12
Odds and sods
Car builder solutions
http://www.nfauto.co.uk/cbs_products_new.htm
Heater take off, wiring, heat reflective matting (DO FIT TO FOOTWELL AND SILL DURING ASSEMBLY, it’s a real PITA once fully built), they also stock high temp contact adhesive, I haven’t found anywhere else that sells it (Evo-stick fails when it gets warm).