On Fri, 8 Nov 2019 11:04:14 -0800 (PST),
wrote:

On Friday, 8 November 2019 18:14:27 UTC, T i m wrote:
Combi boiler in a flat with just a room stat in the lounge (from what
I can see).
Can you get (at a reasonable cost) a simple Clock / timer stat for
such circumstances and if so, would / could they be battery powered,
assuming the stat isn't currently fed by mains?

Programmable thermostat. £29 + VAT

https://www.tlc-direct.co.uk/Products/SMTRT035.html

battery powered, contacts are changeover volt-free

Excellent, thanks very much for that mate. It seems to tick all the
right boxes. ;-)

I think it would be used in the 5+2 day mode as one occupant has the
weekends off and the other two other days in the week (where it could
just be overridden)?

Cheers, T i m