Jane,
Thanks for the email.
I've taken your comments on board and have posted a profile. I'm down in Croydon, Surrey but have relatives in South Yorkshire so pass Nottinghamshire on the A1 when we travel to see them.
I wasn't aware that 121 Highbury Road was Highbury Hospital, so thanks for that, and the picture. The birth certificate was of my wife's first cousin, who is a living relative, so I'm not sure about posting the names under the "invasive of a living person's privacy" rule.
It's the father I've been tracing and I've got some details including his 1971 death certificate. It intrigued me because he "just seemed to disappear".
Thanks again,
Bryan