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Yeah, I can't work out how to do that with the lockshield valves because there's no pin in them and just look like an allen key fitting. Does that sound right?
Not a shared house - 3 bed bed but think you might be right.
Tenderloin-
Not sure about the lock shield. If you need an allen key to adjust it it's unlikely that it's been accidentally turned down. I would try turning the other rads down first.
I realise you're not a shared house, it's just that's where I've seen the most problems. Usually 3 or 4 bed where the boiler struggles in the coldest months.
Airhead
Turn down the thermostatic valves on the other radiators and see if it heats up then. Sometimes you need to balance the flow otherwise radiators get starved. It's a common problem in shared houses where people turn up their own radiators and one or 2 rooms end up without any heat. I'm not very good at balancing them but I've seen plumbers do it to whole houses.