I'm looking for a rotary on/off switch to replace a timer switch. The genuine one I think is a Gottak 4RH but can't find one in the UK.

Need a double pole ~10-16A 250VAC
Ideally a shaft of 4mm square or 6mm round/D shape.
Mounting spacing of 28mm (but can make an adapter if not).

Anybody got anything in their spares box?