I had my GCH on Sunday afternoon for a few hours, yesterday just for a couple of hours, off today, it is warm today.
Why work like a baboon then freeze in your own home?
I don't have my boiler on a timer because my work shifts vary, I just use the thermostat/controller to switch it on or off. Usually I set it at 18/19C when I'm home, off during the night.
Windows open for about an hour every day in winter, all day in summer - if it's hot, which is not a given in Scotland!
I live in a ground floor flat without carpets, because of my fur babies hairballs 😻
My unit does have a good solar sensor however. It's linked to the "I want to go out" app, but only if the temperature levels are acceptable
I've got one of those units, only goes out if she can sun herself

My other unit likes to get wet, but doesn't like to be dried before jumping on my bed.
Failed spectacularly to sort the leaking boiler over the summer
Get the professionals in, before you freeze to death in January, when the inevitable break down will happen but the heating engineers have a long waiting list.
I get my boiler serviced every end of August.
I'd like to bleed the rads (a source I found suggested this was relevant to the leaking boiler issue although I can't see how) however only the heated towel rail in the bathroom actually has an obvious bleed valve; the rest appear blanked or perhaps need to have the whole plug turned to open the system up to atmospheric.
Any thoughts on this would be welcome
Get the professionals to do the bleed and install new valves.
It's only really 'open'* systems that need bleeding, modern 'pressurised' systems don't need it apart from initial commisioning of a new boiler or radiator.
* the old type with an expansion tank in the attic/airing cupboard
Imo this is not correct. I had a new boiler installed 4 years ago, this year I said there were some clunking noises from the radiator, the man bled them.
My boiler is in the kitchen, the tank water only supplies the bathroom.
Also we've both had quotes to fit a 'magnetic filter' to the boiler, mine was £190 and hers is 'in the post' (doesn't like email) so will be interesting to compare them. And actually I don't know yet if a filter is a beneficial thing to fit.
Mine was £100 extra with the new boiler 4 years ago.