There are some images out there. Do a google image search with phrases like " andover UK grammar school " " old andover UK grammar school". make sure to add " UK " in the searches because there is also a school in andover Massachusetts,USA.
Great photos, used to go the Walled Meadow a lot, we was the ones singing, Queen Charlotte was our local Pub, lived in Andover for 2 years 1967 - 1969 on Admirals Way.
I also lived on Admirals way, we were some of the London overspill worked at Hutchins engineering we were there from 69 to 72 wife worked at Croydex I think it was called