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So if I mounted the Honeywell receiver on the wall beside the boiler, say, I would need to (a) remove the 340 receiver (b) change something on the PCB of the receiver (c) remove the boiler front panel and wire the new unit into the boiler (d) replace the panel and (e) replace the 340 receiver?

Not sure what those numbers (340, 360) you quote refer to. I have the manuals for the 837e boiler, which have wiring diagrams. I presume the Honeywell 927 timer unit comes with wiring diagrams. If installation is as easy as you suggest I will happily give it a go. I installed the...

It seems to work okay, and the boiler gets the signals. It's the programming that stumps me. I want the heating on twice a day and once at weekends - a pretty simple setup. But the 340f has its own presets - which seem to assume that everyone gets up at six am and goes to bed at half ten -...

It's a VRT340F, like the heading says. Combined thermostat and timer. There is an RF module plugged into the front of the boiler panel that receives its signal. Ideally I would like to find a replacement programmer/thermostat like the Honeywell 627 that would transmit to the Vaillant...

sorry - was using a laptop computer and didn't see the second line of your reply! Does the Honeywell unit replace the timer and transmit to the RF receiver the same way?

Sorry, yes.

I have searched the forums here and found the wireless timer/thermostat I have, the Vaillant vrt340f (typo corrected), described as 'diabolical'. I could not agree more. I build and program computers and I have never come across a device so infuriatingly hard to use. My heating comes on...