wrote:

And of course the pipe looks somewhat corroded, so cutting the tee then
rejoining with compression is likely to fail. Such joy. Any hints
apprecated! Well, those relating to pipes.

fernox LSX wrapped round with some form of secure binding... um...
Self amalgamating tape perhaps ?

I have done a few impossible situations with that remarkable stuff,
though it's always been on CH side rather than mains pressure, but once
it's cured and supported I'd be surprised if it leaks.

What have you got to lose really.

:¬)

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