Thank you, Kay and Pirate.
I agree Merle Common is very probable - but with no knowledge of the area, I didn't know of it's existence to start looking, and couldn't find anything remotely matching it yesterday.
Pirate, I have rechecked the registers and you are probably right - the Limpsfield records are consecutive, whereas in the Oxted records, the previous baptism recorded was on the 24 Feb 1674/75, next came Joseph Frith who was baptised c 3 weeks before that, on 7 Feb 1674/75.
And not just East Surrrey adjoining parishes, but Surrey and Kent adjoining parishes interlock like fingers.
Thanks very much, both of you.
Margaret