My heating and hot water have stopped working.

The thermostat in the hall clicks when I turn it past about 13-14 degrees.
The boiler has it's little light going.
I've reset the switch in the airing cupboard (with the reset button).
I'm assuming it's either the central heating pump, or the thermostat in the boiler, would that be a safe assumption?
There is some little switch in the airing cupboard that has a little lever thing - auto or manual - that was replaced 7-8 years ago because I had no hot water, but this time I have neither (and I don't have an immersion heater).
Anyone got any suggestions, or failing that, any recommendations for someone who can help in the Reading area?
Thanks!