John wrote:
The taps that you press down which should stay on for a while seem to be the
must unreliable item ever invented as they never seem to work properly. I
guess that with maintenance they can be adjusted and set to work correctly.

What is required to make the delay action work? (I want to challenge my
local pub landlord to fix his)

They're known as 'percussion taps'. AFAIK some models have adjustable
timing and others don't - so if yours aren't working properly then
presumably it's fair to say that they either need adjusting or replacing...

David