I have been intending to replace my bleed hose and the pipe from the header tank to the front heater feed pipe but have really struggled to obtain 10mm or 3/8 Coolant/Heater Pipe. I even sent off to some guy on Ebay who was advertising 'GOODYEAR 10mm 3/8 Heater Water Coolant hose tube pipe' when I received it it was 'FUEL/EMISSION HOSE' and I am now struggling to get my money returned.
So when I was in Scarborough last weekend I passed a little car shop in a side street and popped in to see if they had any 10mm coolant pipe. 'How much do you want the mas asked, 2 meters I said, £3.74 he said, I paid him and walked out with genuine heater hose.

I am now looking at fabricating some bends out of 15mm copper tubing so I can replace the front heater hoses, hose from header tank to radiator and feed and return hoses to rear heater as the nearest coolant hose I can get is 5/8'' or 16mm to fit the metal heater tube which is 17 mm.