In article ,
fredbloggstwo wrote:
I am looking for a way to have a night and day setting for the hall CH
thermostat with the (obvious) ability to set the switch over times.

Have a search for programmable thermostats. They'll do what you want and
more.

www.tlc-direct.co.uk etc.

Does such a device exist? If so, do you have any recommendations and is
it a straight substitution for the usual Honeywell unit?

Not quite - they actually have rather more simple connections, because
they're battery operated. So only two wires needed - and no earth. So they
can replace most thermostats regardless of make.

--
*Learn from your parents' mistakes - use birth control

Dave Plowman London SW
To e-mail, change noise into sound.