Richard Marx wrote:

I'm brave enough I think, however it seems to have stopped seeping. Perhaps
the limescale blocked it up as I suspect happened originally. For now at
least, we are okay. Phew!

That is quite possible - if it is a valve with a packed gland as set
square described, then they can leak if the packing drys out. Once it
gets wet again it swells and stops the leak.

--
Cheers,

John.

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