Hey guys,
A quick update - replaced the pressure sensor at the weekend (highly recommend getting a 17mm crows-foot spanner) - it's a fiddly job, best to remove the lower engine cover, loosen the sensor with the crows foot and then unscrew from above.
And now there's a new error code/fault: AC Pressure/Temperature sensor (G395) sporadic no signal/communication.
Unfortunately replacing the 1st sensor did not solve the missfire, so I'll investigate the 2nd sensor and see what that's all about..
To be continued
Oh yes, the idle has dropped (might be down to me wriggling vacuum pipes) and cruise control is back.
PS - booked into my local workshop next Monday just in case