I did purchase original copies of the census and they do say Walston - one a bit clearer than the other - and that is why I have assumed Walston Ley. Options for a Walston in Suffolk seem to be pretty much zilch. Walston Ley Chevington is in the same vicinity as Newmarket and a few other places with which John Flack the convict had associations. I applied to the Archives at Shire Hall in Cambridge for whatever information was on the marriage entry at Impington in Cambridgeshire and I was given the birth places, so I thought they were part of the entry. Perhaps the researcher used the information on the census returns to ascertain place of birth. The birth place for Ann Dye is given as Mellis in Suffolk. William and Ann Flack are in the 1831 census for Impington and the 1841 and 1851 census records for nearby Oakington. It was from Oakington Cambridgeshire that the family set off for Australia - two daughters in 1852 and the rest of the family in 1854.
If it was usual for bans to be read in a home parish as well, I wonder where to start with that one - was it always the birth parish?
John Flack's mother re-married a William Surridge in 1810, also registered at Hundon, but I don't know exactly where they were living or where they went. I have not found deaths for the mother or step father in the Hundon registers on-line.
With regard to a baptism for William Flack - if he was indeed the little brother of John the convict, and was born in 1808 just prior to the death of the father William, then maybe a baptism for the new baby just fell by the wayside. If so, I suspect I am brick-walled!
My William Flack died soon after arriving in South Australia, in 1855, and no help with parents there!
Thanks for your interest and I do hope you can come up with a new angle for me to find who my William Flack belonged to.