THanks Gaz. Got the service kit as you suggested as was in stock locally.
In a previous post you mentioned 'have plenty of silicone grease ready'. Is this for use within the cover plate, once the diaphragm has been changed?
This also looks like being an expensive leak. I switched the boiler off when i found the leak. However, the microswitch must have shorted and it looks like its taken out the pcb. Visible scorch marks in the bottom centre of the pcb next to a square blue ? relay. Oh well!!
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