Finally got it fixed this week.
Had to take it to a repair shop.
New Motherboard and several quid lighter in the wallet and it's back where it belongs.
For what it's worth the workshop struggled to get the tuners to work. They had installed the Pinnacle Media Centre software to get the driver for the tuner card. This conflicted with the Vista MCE so even though the tuner was there in device manager it would not receive a signal.
Uninstalled Pinnacle, downloaded the latest drivers and wayhey here we are.
Trouble is the DVD doesn't work now......
