Sorry for the rather boring thread.
This is the second time I have had one of these expensive thermostats die on me and having done some research it's not an uncommon problem.
Rather than shell out £75 quid (cheapest price by a mile) I am wondering if I can replace it with a similar but more reliable model, given it doesn't need wiring in.
I did email Honeywell in the vague hope they would send me a new one but am not very hopeful as its a few years old.
Does anyone have any ideas or alternative suggestions - secretly hoping PigletJohn might be lurking...