Hi everyone again, finally bit the bullet and had a new oil pump fitted with the last oil service, a very reasonable £220 including oil service, with our local specialist, (smart vw at newark) what he found was almost exactly as described on here the pick up pipe was badly clogged with sludge but also the plastic tray in the bottom of the sump had MELTED and broken up !!!!! anyway new pump,pick up pipe and whatever the plastic tray is and it runs a dream again, just shows you guys know about your engines thanks for all your comments guys. Nige.