Until 1877 the village of Market Street, or Markyate, was in three separate ecclesiastical parishes - Studham, Caddington and Flamstead and later became a civil parish in 1897. This causes difficulties as to knowing what the records mean, and where the records are held. For instance someone living in the house they were born in at the time of the 1901 census may be living in Markyate but Markyate (as a parish) did not exist when they were born - so what will they record as their place of birth. In addition civil registration records might be in Hemel Hempstead, Herts, or Luton, Beds.
This post has arisen because the help messaging facility has been broken and as a result I have been feeling somewhat deprived as I have had fewer help requests than usual . I saw a request linked to Markyate on Rootsweb relating to the birth of a Mary Vass (possibly in the Markyate area) circa 1780 and her death as Mrs Mary Cain circa 1861. You may see the original request, and my reply, on Rootsweb - but I have also posted them as VASS/CAIN. Markyate, late 18th & 19th centuries on this site - with added links.