Flat tank Douglas combo & a mystery machine...

Douglas 6hp combo and in the foreground a mystery v-twin.

The machine in the background is easy enough to identify, a Douglas, I would guess a 6hp model. But the cycle in the foreground is a mystery. It's a big v-twin, there's a Sturmey CS box in there and the name looks like it begines with a V or W and ends in or has a 'ton' in the middle. No idea. Any enlightenment gratefully received.