No they're not the right instructions. Ive found the correct instructions (http://www.worcester-bosch.co.uk/cache/file/275/user-manual-for-greenstar-si--manufactured-aug-08---july-09.pdf) but it doesnt say in there how to re-calibrate.
Thanks for your help, im going to contact technical support tomorrow to see if they know the problem, im sure its something very simple
Marc
November 2010