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ok, thanks for all the info. i'm not tempted to give it a go myself.
anyone got a recommendation for an engineer near hackney? one that wants to work on Christmas Eve?
dinosaur-
I used John at Full Flame for a diverter valve that needed replacing.
He's often pretty busy though so I'd also try
https://rokas.london/The guy at full flame is more likely to have the spare part with him though.
aggi
I don't know your boiler well enough to say how the filler loop taps are set up. On an external filler loop which is usually the older variety it's normally clockwise to close a valve. You are supposed to open both and one of them is a non return valve. There are supposed to be disconnected when not in use (not that they ever are).
It does sound like the diverter valve is stuck. That is mostly a regulated job to fix. Not sure if googling will give you information.