I’ve got as far as working out that the flush system is a Wirquin Jollyfill telescopic bottom entry inlet valve (pic below). Aug 2014WIRQUIN JOLLYFILL – FULL FLUSH BUTTON. Jollyfill_9_1_2_Fix_Bottom_Entry_Inlet_Valve.
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Free repair help – water weeps into toilet pan jollyfill wirquin. Free repair help – wirquin jollyfill full flush button stays down. Jan 20- But I managed to fix them all.
Supprasingly, I have found very small pieces of junk where the Diaphram is (all Jollyfill). Wirquin Jollyfill Topy Inlet Float Valve Diaphragm Washer 10717797.