Thanks again everyone.
The Richard Arthur Elliott we are looking for definitely had the parents of Arthur Godfrey and Frances Lucy. We have an original birth extract that has his birth as 8.2.23, Bishops Stortford. We have also purchased a copy of his original birth certificate, which confirms the parents as above.
We have just found the information on his sister Ann Hynde, so thank you for that. She was certainly was a student at St Hughes at that time, but may have been home on term break when the census was done. This week have also just found a second sister, Elizabeth, whom we know nothing more about.