Ok, the part I require is pch113520eva. From the thieves known as rimmers the price is around 50 squids inc del. There is an alternative one for earlier models with the no. pch10384 which is 20 squids delivered. Does anyone know if there's a difference between the two ? Both are radiator hoses from the head to the silly metal pipe over the radiator. Looked into buying bits and making one up but it doesn't't work out much cheaper.
Regards
Paul

Might be of help to others. Vauxhall Agila top hose, pt no. 8-205-311 fits with a bit of a trim and costs £7.50 inc del.

very cool advice. when original spares come more and more scarce we need more and more of this sort of info compiled