Grandad
thank you for your response, i have managed to dig out the manual and have also updated the driver for my graphics card. i now have a perfect picture and need only to sort out the sound. according to the manual the best option is HDMI cables as these carry both the audio and video feeds together. unfortunately only my TV has HDMI sockets, not my PC.
i have had a good look aroud and have found a cable which has s-video + 3.5mm jack at one end (PC) and standard red, yellow and white AVI sockets for the TV input. it sounds as though it should work and at only £2.49 from e-bay with free delivery has to be the cheapest option available.
i will post back to let people know if this works ok