Probably started leaking at the flush cone because you've been disturbing things - always happens!
seems to be fitted just with putty/mait.
I’ll have a look at fitting a new flush cone.
Put a smear of LS-X around the flush cone, it was only slightly, possibly, damp when adjusted.
Bought a new Thomas Dudley flush valve, but the cable was too short, so, upon further investigation, this was the button issue - not sure if it was supposed to have a terminal on the end of the wire:
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