ok, update time. 2 and a bit hours bike fit session - extremely useful and informative. I ended up with the M frame, rather than the M/L and with the stem at 110mm, rather than the stock 100.
Could have told you that on day one. No offence like. When you've done a few good rides and spent some time in the saddle you can make little tweeks, but by then you'll probably know what to do.
All sorted in time for the snow and ice

