Hot air

[David]

Are there any instructions on how to set it up when I do get around to fitting it ?

Plenty of information in various threads if you search around a bit, Steve, but these should be a good starting point:
https://www.two-sixties.co.uk/mgoc26...ighlight=Duper
... and this on setting or resetting:
https://www.two-sixties.co.uk/mgoc26...valve-actuator

David