Thank you D Hailsham for reply (I've been away a few days)
Thermostat in Toilet is definitely Boiler Thermostat, I did it myself 29 years ago.
Was able to take Boiler Thermostat box out of Ideal Concorde and fixed near top of wall in Toilet and Thermostat Sensor fed back into Boiler...
My 29 year old Ideal Concord has now packed up & needs replacing.
It was in the loft but the boiler thermostat was dropped into the Toilet below and fixed to the wall, so that Boiler Temp. could be adjusted.
Does anyone know whether the same can be done with any of the modern...