Gary, If that is 22nd Bn. The London Regiment (Queen's) as it looks like from the markings on the petrol tank then they changed back in December 1936 to become 6th (TA) Bn. The Queen's Royal Regiment (West Surrey)if that helps with the date. This battalion won the London Territorial Transport cup several times in the early 1930's but that was with horses. Ian
The first three certainly are, followed by a civilian Matchless and two civvy bikes that I can't identify.
It's interesting that the rather competent W/NG should have ended up with the Home Guard. They seem to have been used in Italy a lot but in NW Europe were fairly uncommon except with the RAF. Presumably just logistics and servicing that restricted the British Army mainly to WM20s and G3ls.