Dependent on whether you need Male-Male or Male-Female, one of the following:
http://www.maplin.co.uk/Module.aspx?ModuleNo=97365 - M-F
http://www.maplin.co.uk/Module.aspx?ModuleNo=97367 - M-M
And then for sound, presumeably one of these:
http://www.maplin.co.uk/Module.aspx?ModuleNo=31700
Check your TV has the audio input, and that it works with the VGA connector. I'd imagine it does, but it's always worth checking; it might not.
As for the cables, you might be able to get them cheaper from elsewhere, so shop around.