Alf - If you lived at Roxborough House in Nelson Street, and went to a C of E Primary School, you probably went to Church Street School. Having done a search on google streetview, it seems to be called The Whitminster Centre, and is Stroud Youth Centre and Stroud Area Youth Office. It's a pupil referral centre for 14-16 year olds.
Four of my children went there, the headmistress at the time (1960s/70s) was a Mrs Tyrrell and the school motto was "Aspire High", which was a pun on the fact that the church had a spire.

Here is a photo. Ring any bells?
Lizzie