Nigel, thanks for that....you've solved it!
Manson
manson goldsmith
October 2011
Ignition OFF
Press and hold in the button by the water temp gauge
Ignition ON (not starting engine)
Keep button held in for ~10 seconds
Display will show "0" and spanner symbol will go out
Release button
Ignition OFF
nigel
October 2011
Think it will have to go onto the relevant code reader to help with your problem