Moonstone Steve, I will see the man in the week, and ask, reisskahn the original fan fuse is in the fusebox under bonnet ie the main fusebox.
If they have stopped working look first for a melted fuse position or a blown fuse.
The only way to test the rad fan switch is to let it get up to temperature so that it should switch on, however first it would be wise to test the fan circuit by briding a wire across the two pin connector as this will then put the fans on, well it should all being well!!
tabetha