Thanks Ian that is fabulous. What a very skilled man and what a lovely, although impractical, bike. My wife and I visited a folk museum near Hutton-le-Hole in Yorkshire (began with an r but I can't remember exactly) and they had a section for agricultural implements awaiting restoration. One was a rotavator with a big side valve J.A.P engine and my wife said 'there you go you could get that running'. I said flippantly that if I did I would want to put it in a motorbike frame. Sadly I was dreaming as I don't have his level of skill but I wish I did. A nice sv engine green laner would be lovely.
Ian
p.s. Maybe if I bought a flat cap my skill level would climb!