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I have a similar issue and thought about smart TRVs and stuff but it is a very hefty outlay that will take a long time to pay off if you've got a decent number of radiators (and they're pretty ugly).
I ended up just getting a cheap fan heater (£20 or so from Argos). When I'm working during the day with no heating on at all it brings a room up to temperature very quickly (probably costs 30-50p depending how cold it is, etc) and then maybe 10-15p an hour to maintain that. Cheaper/quicker if it is just topping up the heating.
What's the best solution here?
I have one room, eldest's bedroom that gets NO sun all day long. It's colder than all the other rooms, there's a built in cupboard that's cold too.
It's bare floor with a rug, curtain, double glazed, and a blackout blind.
Do I chuck the heating on, if I fuck around with all the valves to only keep this rad on the house will get out of wack (crazy piping in this place) or do I buy a plug in heater/oil rad and put it on for a bit to keep the chill off?
It's not quite cold enough for the heating on all day long.