Like Trees I'm a long standing movement member - but of course originally Guides not Scouts.
If I can add my two -pen'th: I think the badge above the chevrons on the right arm is the old Second Class Badge.
And, I have read somewhere (can't remember where?) that B-P. considered the second and especially First Class badges to be the ones a scout should aim for, thus they were originally on their own - ie: interest and service badges on one sleeve, second and first class on the other.
Also, I did wonder when I first saw this picture whether they were a particularly affiliated troop - the chevrons for example I don't recall seeing often, and PL stripes were pocket-worn from quite early on, plus the "life-buoy" badge - which I have never seen before.
Your mention of the Sutton Coldfield Jamboree brought back memories - I recall visiting it with my brother's troop - and Jamboree has a special place in our families scouting history - (switch off here if you wish !) When I was enrolled as a guide in 1956 I was enrolled with my mother's trefoil badge, and she had been enrolled in 1929 - and was a visitor at the Arrowe Park Jamboree that year.
Mum went on to be a Ranger, Guider and for 30 years was a Brown Owl, I have been Guide Captain and Akela, my brother has been Queens Scout, Venture Leader and is now a gang show producer and District Leader.
But I still can't identify anything else in the picture!