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To be honest I'm not comfortable replacing it, so may get an engineer in even thought it sounds trivial when you know how. Ho hum... I didn't realise there was an override, which I've now pressed and the heating has come on. Thanks for that! Having just Googled the manual it appears I will have...

I've bought some new batteries but it still does not work. So, it looks like I need a new thermostat, which leads me back to my original question. Can I buy a replacement one and fit it myself, or do I need a heating engineer to fit a new replacement one? Thanks.

Thanks Bazdaman, I'll buy some new batteries first before doing anything else. If I were to buy the Honeywell CM927, would that require fitting by a heating engineer or is it something I can do myself? It's more a question of whether I can get central heating back on today or will have to wait...

I noticed yesterday (Saturday) evening that our thermostat - a Siemens RDJ10RF - had stopped working, inasmuch as the screen was blank. I changed the batteries with several new sets but it still didn't work. This may be because the unit has been accidentally knocked onto the floor several times...