Hi
Thanks for your input.
I'd already checked the new FamilySearch site and IGI records and had hoped to find someone who had access to the parish records, as they don't show on there.
I hadn't seen the other 'May' at Whittington so thanks for pointing that out - will consider it further. Agreed that the purchase of the marriage certificate would be the best action but not being my direct relative, I don't intend to spend money for something in which others should invest, but will leave that to my cousin. Although given the specific birth date there is only one registration that fits (given that births should have been registered within 6 weeks of the birth), but as there are many Mary Jane Williams (even Oswestry registered) I want to make sure.
It will become more obvious regarding my selection if you look at the 1881:
RG11; Piece: 2660; Folio: 110; Page: 10 - Mary (bottom but one) a servant but next door to a family of Williams in which Mary's age would fit well as a child. Using that as a possibility, I found (transcribed just as William) the same family in which probably Mary is shown but transcribed as May William.
RG10; Piece: 2785; Folio: 71; Page: 24
As often the case in censuses there appears to be a very slight age discrepancy possibly based on information not provided by the head of house or perhaps age being falsified for a 'servant' as may have been illegal.
I'm not discounting your other Mayd (which looks to be Mary J which fits), but have yet to find a corresponding 1881 census for that family as a double check.
UK 1891 census will not help, as they then show on records in Canada.
Kind Regards - Dave