See my post from last night, live is a series of switches, runs via timer, roomstat to diverter valve, stop there, timer must be on, stat must be on this is all possibly 240v, with timer on & stat on the valve should open, when open it also trips a microswitch with its own permanent live feed, the live should go from the microswitch to the boiler & pump switching them on.
The diverter valve micro switch & motor are items you will reconise, they often fail, is there a 10 way junction box where all these cables connect in to each other.
Added: if you are in the airing cupboard with the cly stat and a screwdriver/tester tningy with a neon in the handle you should be able to carefully check the IN terminal & the OUT terminal and move the stat to insure its working.
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