Where to buy a double pole pull-cord switch for bathroom fan

Hi. I am trying to replace the pull-cord switch of my bathroom extractor fan. I have now determined (after wasting lots of time, and trying to replace with normal 1 and 2 way ceiling switches) that the existing switch is a double pole switch (where the switch switches live and neutral at the same time - there are 4 terminals plus earth). But I cannot seem to buy a replacement switch anywhere! Can anybody help?
The only double pole pull-cord switches I can find are rated at 45A, which I think is too high for an extractor fan - I was thinking 5-6A??? I have been offered a 3 pole fan isolator switch but I don't know whether I can use such a switch to replace a double pole fan switch???
Replacing this switch has turned into the hardest DIY project I've ever tried. Any help would be much appreciated!

Any good?

http://www.tlc-direct.co.uk/Products/MK3151.html
+
http://www.tlc-direct.co.uk/Products/MK2051.html

One of these http://www.mkelectric.co.uk/en-GB/P...lingswitch/Nonblocksurface/Pages/3151WHI.aspx

B&Q have them as MK Ceiling Switch 1 Way White 16A

Thanks for your very quick replies!
As I am a complete electrical novice, can I just check that 15-16A isn't too high for an extractor fan?
And will both switches have 4 terminals plus earth?
As you can't see inside a switch until you've bought it, I'm wary of buying any more switches, getting them home and then finding they only have 2 or 3 terminals! I need more than Com, L1 and L2...!
Thanks again.

Yes they are double pole (4 plus earth) (though B&Q site says it is single pole it is not).

With a switch (or socket or connection unit or any other similar accessory) the rating is a maximum it can handle, you can use a smaller current on a higher rated switch but not the other way round.

The switch and base come separate, you can see the connections thro the plastic packaging of the switch