Okay Dennis,
I said I'd find out more and I have

Roger Gilbert Bannister born 23.3.1929
2nd child of Ralph and Alice
Father Ralph was one of 11 children and born in Colne, Lancashire
The family moved to Bath(where Roger went to school) near the start of the war and returned to Harrow after it.
Would love to hear if this does indeed turn out to be 'your' family.
All the best
Carol
PS have sent more info as a PM to you.