Sorry guys. Speedo playing up (Koso) and the last time that happened I had a major electrical fault. I am pretty sure disconnecting everything, spraying some some WD40 and reconnecting will fix it but it's a daylight job. Left Chatham (it was fine all the way there) stopped for petrol and phoned home saying if the problem was not fixed just by turning off and on again, I'd come home. It was fine for the next few miles then started again - going from 0-138mph in seconds then just sitting at zero. Had to make a decision at the M25, try a three hour drive and hope I got there or 20 minutes home.