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If this is the case could it not be rewirred at the programmer/boiler end?

No I dont have underfloor heating. Its not a dedicated floor heating stat its an optional sensor and setting. The default setting is to measure air temp. So the old stat is a 20 year + Drayton RTC. We had the main programmer changed fron an old Danfoss Randell 4033 programmer to a Honeywell...

1) No its not a good screwdriver so throwing away now. 2) This is what i do not know and what I need to determine. Thanks ban-all-sheds

Can anyone help with a connection issue i have changing my old Drayton Type RTC room stat to a Excelvan BYC17.GH3 Programmable Heating Thermostat. On the Old Drayton I have 2 cables coming one with a red and an earth wire and the other with a red, earth, Blue and a yellow wire. Earths go to...