For all of you who ever followed this enormous saga, I have a little update, years later.
First thing I would ever recommend that you do - and Katie will tell me off for not having done so immediately I got the death certificate - is check the newspapers for a obituary. I really thought, as Margaret's son William was reputed not to have a lot of money, that there wouldn't be an entry but when I discovered it appeared to have been entered by the family she had worked for, for so many years and also it stated that she was buried in Knotty Ash Church.
I checked for St John the Evangelist and discovered the Burial Register was transcribed only at the Record Office and that the original had been taken back by the Church. Rather than just checking the transcript I telephoned and spoke to the Vicar who allowed me to go along and photograph the entry. I was so pleased that I did as he was able to take me to Grave 152 where I was astounded to see not only a cross, with stone beneath it, but that it gave her exact date of birth 31st August, 1845. The family she worked for, the Rogersons, must have thought a lot of her and perhaps even celebrated her birthday each year. It must certainly have been them who brought her back to Liverpool to be buried and erected the stone. I have discovered that the father was also buried in the same churchyard in 1910.
I spoke with the Cheshire Register Office who
should have had the records for Neston, but it seems originals aren't available to be checked and they would only take orders based on the Cheshirebmd site. Unfortunately the GRO also won't do a search based on just a forename "Margaret", birthplace "Neston" and birthdate "31st August, 1845", too much to hope for. So I paid for three birth certificates that seemed most likely to me, doing a cross reference between the indexes and Cheshirebmd and specified the criteria of birthplace and exact date of birth.
Two weeks after I ordered these, on Friday afternoon I missed a telephone call that asked me to contact the GRO about the certificate I had ordered, and then today, despite it being Sunday afternoon I have received TWO refunds for incorrect certificates ....... Watch this space, I am holding my breath until tomorrow.
For anybody else who has outstanding BMD's missing from Cheshire, please take another look as both FreeBMD and CheshireBMD have certainly been updated since the last search, especially as one of the entries seems to be in the right place at the right time - surname KEMP.

MaryA
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Names - Lunt, Hall, Kent, Ayre, Forshaw, Parle, Lawrenson, Longford, Ennis, Bayley, Russell, Longworth, Baile
Any census info in this post is Crown Copyright, from National Archives