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Unfortunately he was unable to supply them 'My suppliers have said that they are unable to source these parts. Your best bet is to try Plymouth based Japtec'
Looking at Bongo Parts supplied online by various suppliers I think we are talking several hundreds of £'s here to replace all hoses so I am going to go down the DIY route and obtain staight lengths of coolant hoses and elbows and make my own pipes up.
As far as I can see the pipes to and from the turbo are 8mm or 5/16", the Bleed Pipe and Header Tank to Heater is 10mm or 3/8" both available. The metal pipes to and from the rear heater are 17mm but I am going to try and fit 5/8" or 16mm rubber hoses to them using copper 15mm elbows and short lengths of 15mm copper tubing to form the necessary bends, I shall also use 5/8 for the pipe between the radiator and the header tanks as well as the pipes to and from the front heater.
The crankcase-cylinder head bypass pipe (just above the thermostat housing) is 21mm or almost equivalent to 7/8", you can buy an elbow in this size to adapt to suit.
As yet I have not traced any 35mm or 1 3/8" elbows and straight pipe to form the upper and lower feeds to the radiator, will keep looking.
As I have had two leaks in two weeks, one from the bleed pipe and the other from the header tank to the heater it is apparent that all of the rubber coolant pipes are nearing the end of their useful life and I will feel a lot more confident with them all replaced instead of keeping a very careful eye on the temp gauge all the time and fearing the worst - it takes all the fun out of Bongoing.

Will keep you informed of how it goes.