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@Airhead
If you are adding them to the bathroom you should probably get an electrician to do it. The bathroom is one of the few remaining "Special" locations where electrical work is notifiable. You can replace existing accessories although you are still obliged to make sure the work meets standards set out in BS7671.
If you want to carry out the work yourself you can apply to the local council and pay to have the work inspected by them, it will cost between £150-£300 depending on your borough.
The extractor fan should be on a double pole switch.
You need to know several values unique to your installation to establish the rating of the fuse and size of cable for the towel rail, these values can be determined by testing. For example your earth fault loop impedance and prospective fault current and the Zs value (resistance) at the towel rail. As it is a room where you are likely to be wet and naked the fuse rating is important as well as the RCD protection which rive mentioned.