>One of the radiators is a double panel,..
On the, now replaced, double panel radiators I had the bleed screw was on top of one of the pipes connecting the two panels. It was set inside a small dimple to stop it protruding.
>..in the airing cupboard, the tank has a TRV body.
No 3-way valve, just a TRV controlled 2-way?
Is the pump in the airing cupboard and does the CH pipework branch off the pump there? If so, I'd be looking to see how much work is involved in changing to a 3-way with electric tank thermostat. Always better to have a system using bits a plumber keeps in his van or you can buy off-the-shelf from a DIY shed. Wiring, or lack of, might be your problem though.
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TRVs new
TRVs new