Central Heating Thermostat, only live and negative, where's the switched?

[JollyGreen]

Right!
New thread for this one I think!

I've just been decorating (innumerable threads have shown), and I ripped out (and chucked away, DOH) my old wall thermostat as it was pretty ugly.

Fitted a new one, (easy enough one might think) and this one requires three wires where I have two!

It wants, live, neutral and switched.
I only have the first two! (red and brown)

What do I do to make it work gang?

 

[JollyGreen]

Cheers guys, just went to B&Q to have a look at 'em, and as far as I can see they all require neutrals.
Where do I lay my hands on one that doesn't?
And what's it called?

Also, am I right in thinking that to test my Central Heating I can just connect the red and black wires? Or would that result in me getting electrocuted and probably a small fire?

EDIT: and Adam, on further inspection you are correct, 'tis black not brown

 

[JollyGreen]

Lol none taken mate, I'm not really, but I'm trying to save money and only electrocuted myself once so far

Mel_P aah, interesting, HWM.gif would appear to be most like my setup!

 

[JollyGreen]

Hmm, well I ended up crossing the wires which did the trick and turned the boiler and pump on.

However it looks like the pump got turned on while the system was drained and is now.. somewhat dead (making horrible GNGNGNGNAARHGH noises).

Anyone got any tips/tutorials on replacing the pump?