Hi All
Thank you all for your swift replies. Steve you are a genius! Reset to miles and voila, correct reading. How I felt silly and relieved at the same time! Ian I shall examine the brake master cylinder carefully as I once had a similar problem with a BMW R1100 which I had totally forgotten. Michael you are a real tempter, but as Dick Emery used to say 'oooo you are naughty, but I like it'.
Thank you once agin chaps.
Ian