Yes Alan, I assume it's a wedding in progress from the button holes. Out village historian passed it to me to date the bike as it would give a clue to the date of the photo. He already has the location as the doorway and window haven't changed.
Apparently the E Yorks series for 1923 began with BT6138 so that puts BT4200 back to ? maybe 1920? Hard to say really as Wartime registrations would have been in quite low numbers and you'd expect them to pickup after the War. !919-20 seems a good guess though! Remember a lot of ex-WD bikes were re-furbished for civilian sale after the War so this needn't be a brand new or nearly new machine. Pete, where is the location? Interesting!
REgards, Mark
PeteF Yes it is a Triumph Model H Probably the picture was taken in the early/mid 20's. My own 1915 Model H was in the first year of manufacture and all were for War production. Over 30,000 were made and after the War any complete and parts of machines were returned to Triumph in Coventry for rebuild and sold to a transport hungry public. The Model H was the despatch riders favourite, followed by Douglas.