Update for you folks,
The speedo definitely works now that it has been supplemented with the correct drive washer.
If you should hear a light high pitched squealing noise when riding then check out the chain roller guide, it should have two bearings with I think 7 balls in each, mine was noisy and only had two balls in one side
, replaced the item today and the noise has gone away
If yours feels 'notchy' then replace it anyway, they cost less than £9.00 so why take the chance on it failing out in the sticks
I have had a mushroom headed vulcanised patch repair to the rear tyre after that 6" nail event, the hole inside the tyre looked as though it would eat away at the replaced tube.
I have also fitted a set of Apico handlebar risers, feels much better standing up on the pegs in the garage, yet to be tested this Sunday in the Peaks.
See you out there.
TTFN
Hugh.