@heathblue "
I"s that valve a Caleffi 526 model ?"
https://www.waterware.co.nz/products...20mm-x-700kpa/

Certainly looks like it....I'll also have a search tomorrow.

"I'm presuming that it's leaking through the valve and not where the grey elbow is screwed on ? 2
Correct......just seems like the red switch needs cleaning so it closes properly.

@Tuerto
Things is that it's not even so much the cost of the part.....it's the cost of fitting it...not confident I can do that myself.