Thanks for all the help with WilliamT. You're right, his parents were James & Sophie - and I got it wrong (from memory - huh) Robert went to Cambridge, and his son Hubert Francis went to Oxford. Robert & wife Dorothy may have accompanied a group of emigrants to USA, then returned, but can't prove it.
Now to research William further: this family is a bit of a mystery, difficult to fit into the - back to 16thC - general Bucks tree.
Having received a pension back-payment, I invested it in a findmypast sub, so hope to have made life both easier and more exciting for myself.