Since my last post I have done over a 1000mls; no problems. Took to local Scots dealer for work on the moggie, told him not to bother about the speedo problem because it seems to have gone away - how wrong can I be. Picked up the moggie, driving home no speedo, calibration fiqure in digital display - quickly back to the garage. Morgan mech comments " never seen this before ". Took it off to the garage for further investigation. Back, after a short while, found that when he disconnected the reset button, speedo back to normal. Seems reset button maybe faulty. Am now driving around with the reset button disconnected, just to make sure before I get a new reset button.