Thanks people.
Cables are fine sagers
Juan, it is an early HD ready TV that has scart and composite for TV or DVI for PCs and consoles.
Ice storm, I think you've come closest. I did get the thin optical/av adapter but the problem was getting the sound to the TV as the only audio in seemed to be the red and white composite sockets. Unfortunatly the TV would not recognise the input from these
when the signal was coming through the DVI port. I have just found a DVI audio socket tucked away underneath that seems to take a 3.5mm stereo jack.
My solution is this - Video feed now runs from HDMI on the back of the xbox to the DVI port (HDMI to DVI cable £2 on amazon) on the Telly and above that I've used the thin optical xbox adapter with 2 x RCA cable running to a 2xRCA to 3.5mm stereo jack into
the DVI audio in on the telly.
Just ordered the jack converter of amazon for 60p and will let you know if it all works when it arrives.
Ps. The obvious answer of optical to DVI doesn't seem to exist.
G