Central Heating control unit replacement - advice please


A little question, if someone could help I'd appreciate it.
My heating timer control at home packed-up last week, resulting in the heating being on all the time. The control is an old classic Randall 102.
I need a replacement, and B+Que in Chiswick have a large selection to choose from. It's a pity their expertise isn't of the same magnitude. (Well, actually, it is of the same magnitude, as, although they have some 15 - 20 models to choose from, they only offered me 3 that they had in stock, and their heating expert doesn't working there any more. Their manager couldn't even point me in the right direction, apart from Wickes, so I didn't hold out any hope for qualified advice).
I'd appreciate an opinion and pointer in the right direction for a replacement.
My old gas back boiler (with gas heater, a BAXI Bermuda 551) has a thermostatic control dial on the unit. This is the only temperature control I have. I assume it's taking the heat of the return heating supply. The only other control I have is the said ban-jaxed Randall 102.
Cables going into the Randall is 240v mains and, I assume, the other cable is the control cable to the gas boiler / heater.
I could just get a simple replacement timer unit, but I think is should be possible to get a control timer unit with a separate room thermostat hard wired back to the control timer unit.
Does anyone have any suggestions as to either a heating control unit, or HCU & room thermostat combination?
Seasons regards
Damian
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Damian wrote:

<SNIP>
Sounds like UK-specific equipment.
Post to this newsgroup: uk.d-i-y
Cheers, Jim
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