I've got the P1260 low pressure warning light on changed both fuel pumps, so it's either the loom or the sensor - so I thought I'll go for the cheapest option first the replacement loom....£60 Bloody hell - £60 for a few wires and a plug - Has anyone made up their own lead, I'm sure this could be done for under a tenner, I think I'm gonna at least try as long as I can get the plug

You should be able to continuity test all the wires in turn. Then simply splice in a new one if you find one that is open circuit.