Seal between the element cap and the boiler?
That'd be my bet, at least if those white marks are watermarks from the leak. Might also be worth checking if any of the 3 allen bolts holding the element cap onto the flange are loose.
I checked them all- done up tight.
I’ll have to buy the spanners - does anyone know the sizes?
@mmccarthy started
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Seal between the element cap and the boiler?