BigAl31

@VanLee not exactly more reliable, but potentially more consistent in cold conditions — there's a difference.

@George1975 — you've cut off before telling us what fixed it! Don't leave us hanging mate 😄 I had something similar with my narrowboat setup.

Cheers all for the solid advice. @NotAnElectrician80, one thing I'd emphasise: get your building regs sorted early—Cotswolds planning can be finicky.