The one on the left, well I have no idea. All I am fairly certain about is that he is wearing boots that go up towards the knee. Did other regiments wear a bandolier, and have a white lanyard?
Leather bandoliers were typically worn by cavalrymen, or by those involved with the "transport sections" of infantry regiments. They would also wear boots rather than puttees. These men are members of the Oxfordshire & Buckinghamshire Light Infantry, but they are wearing bandoliers and lanyards.
Great photo euryalus! Well that widens the possible unit id . I will just have to try and trace any military involvement of all the sons of the elderly people, who I assume were my nan or g'dads g'parents, and maybe even their families = 8 families . Some son's units I know, others not.