alternative source for 'caterham' parts?

[fergus]

I have a 1.8 EU2 VPHD engine and need the following. Can anyone suggest sources cheaper than Caterham (probably not too hard)... (caterham prices in brackets, includes VAT)

HT leads (42)
throttle cable (33)
clutch cable (25)
cam belt (25)

scavenge hose 1" i.d. (31)