On Wednesday, 17 July 2019 20:23:00 UTC+1, JohnW wrote:
How old is the tap? I had the same issue with Caple on a three year old tap. Caple have a 5 year warranty which they honoured by changing the tap for a newer model.

Snap! Three years to the day. But a) we don't have a receipt (might be able to chase down evidence if we really have to); b) we don't really want to change the mixer - even if under warranty. Got the same model in the utility room.