I have relocated an existing pull switch to outside its bathroom. Now
I want to change it to a 'normal' switch. However, it has more wires
than terminals in a normal switch. I think I need a special type of
switch (boiler?), with more terminals. Can anyone advise me whch type
of switch I need and how it should be wired?

The existing pull switch has four terminals and an earth terminal. It
is wired;

- Earth (which I assume I wire to the new switches metal box)
- Red to one terminal
- Black to one terminal
- Second red shared to two terminals by way of a link

The switch activates a ceiling light and also a shared extractor fan.
Any help would be much appreciated. Nick