Just to add to this thread as to how i got on....................ended up visiting the local detailing store.Got a product from Chemical guys called foaming citrus.I wasn't expecting much as the car in question had been to a valeters but this stuff is amazing.It shifted some heavy duty staining from fabric seats with little effort.Diluted it down as per instructions,blotted off any excess damp with a microfibre cloth and let car run with heater on.Really impressed !!