Sorted that radiator and the leak I introduced between the lock shield and the pipe! Why do they fit recessed drain taps that require a square key - had to find a plumber's merchant to sell me an appropriate key. I'm also now able to operate the (previously seized) isolator valve to the C/H top up tank.
Next question: One of the radiators is a double panel, convector (it's got square corrugations between the panels). I can't find a bleed screw on it. There's a couple of (heavily over-painted) domed heads. Do these reveal a bleed screw, or are they plugs into the water jacket?
The system consists of a wall-mounted boiler (Gloworm Ultimate), which I guess must be at least twenty years old. All the radiators have TRVs and in the airing cupboard, the tank has a TRV body. I'm sure I saw a capillary pipe running off this when I first viewed the property last April, but that's now gone. I presume there was some sort of remote activation to control the cylinder hot water temperature. I can't identify the type of body and it looks like the sort that requires an Allen screw to lock the head to the body. Anyone any idea what these things are called, so I may try and find a replacement head to control the hot water temperature? I appreciate it's not good practice to have all TRVs, in case they all close and the pump is pumping against closed valves. I've identified one radiator I can leave fully open.
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TRVs new
TRVs new