Hi. I think I have found my William Gray. I sent a request to the Huntingdon Record Office, & the archives assistant there, not only replied to me, but also sent my request on to the Cambridge Record Office. They very quickly answered with the following:
Dear Pat Flaagan,
My colleague Laura Ibbet has passed your enquiry to me here at the Record office in Cambridge concerning your query into William Gray's birthplace as appears in the census. 'Cambridge Well' is a generic term for Upwell and Outwell. We then checked the Cambs. Baptism Index which confirms that he was born in Upwell.
I hope this information helps.
Yours sincerely
Yaye Tang
Archives Assistant
Since they found him in a Baptism Index, does that mean there is a certificate that I can request?
Sincerely,
Pat Flaagan
(on a very hot day in Grand Forks, North Dakota USA)