Just came across this. I know no one has replied for a while but here goes. I also got a badge of a member of the Tree Lovers League. I attended Cromwell Street School from 1960-66 and a number of times helped on tree planting. As I recall these were on the tower block side of Cromwell Street where Severn, Medway and Thames houses were located but the momeory may be playing tricks on me.
Phil, I have dug out some old school team photos, cricket and football from 65/66 and I will try and upload them.