1. Where is the best place to pick up unleaded fuel injection pipe. My local motor factors doesnt have any and the stuff on the net seemed expensive to me?

2. Where would the best place be to pick up a relay and fuse for my HP pump. My ecu will drive it witha ground but i don't know whether i should get a new one, or go to the scrappy and remove one from a relay/fuse box.

Just use standard microbore heating pipe, get it from B&Q in a roll.

As for the relay, it is a standard relay so any relay will do. Just go down the scrappies and pull a few.

relay - your local maplin sell them for about £ 2. 12 V at 40 A (? from memoroy) anywaysd, certainly swithc more current than you need for your fuel pump.