Hi Tommy, you cannot get the switch, it has to be a unit but these are quite cheap and if you have a good quality soldering iron, easy to do.
You need part no W0000051 and this is pcb assy, it is £21 plus vat and postage.The mains screw into a green block and then there are 6 coloured wires you solder in.It will keep you busy on a sunday.Hope this helps. All the best.
FOXY, September 2008