David,
Thank you for your help. Hauxton was the "home" parish for the Parkinson's. The 2 baptisms you refer to in 1827 for Sarah & Peter suggest family were away from home or county as Sarah was born 1817 and I wonder if they were baptised after returning to home or county?
The excellant CFHS shows Mary's husband Allen in Hauxton in 1841 & 1851, he also appears on the census for 1861 and died there in 1865.
I therefore assume Mary died pre-1841 and therefore interested in the 2 burial details for for 1826 at Cambridge St Michael and Cambridge All Saints.
Mary's birth is uncertain so not sure if a 47 or 52 year old ties in. I will have to try the Parish Records as you suggested.
Incidentally, my 2xgreat grandfather William Parkinson (eldest son of Allen & Mary) was baptised in 1813 Sawston Indep and living at Stapleford.
Thanks again for your help
Colin