Update 10/10/21 - Big thanks to Nick Smith for identifying the bike as a Humber 3.5hp of between 1909 and 1911.
A challenge for the veteran experts out there. I've personally completely failed to id this combo, best I can say is that it probably dates from 1912-1914. All images on this site are scanned to 600dpi so as a tip right click the image, open in a new tab and click on the image to enlarge. If you can put a positive id on the bike please do get in touch by mail or comment to share your knowledge.