Thanks Jan, you are on the right track
An explanation - My Timothy Turner (we have encountered him and his 17 children in earlier posts

) was baptised in 1803 in Hanworth Middlesex s/o Thomas and Elizabeth. I had never found a marriage to establish Elizabeth's name. There were 3 other baptisms - Sarah 1797, Catherine 1799 and Henry 1805.
Today I found a marriage in Chessington Surrey, a mere hop into Hanworth in Middlesex, 17/6/1790 of Thomas Turner and Elizabeth Punter. This couple baptise 4 children in Chessington - Robert 1790, Elizabeth 1792, Hannah 1794, and
Harriett 1795, which fits rather conveniently with the 4 births in Hanworth from 1797
I have found Henry b1805 in both 1841 and 1851 with a wife named Charity (b1814 Newbury Berkshire), and a baptism of a Charity Wateridge d/o John and Charlotte 8/5/1814 in Speen, Newbury, Berks.
The children born to Henry and Charity after the introduction of registration, have a mmn Wateridge/Wateredge, as you have found
If this is the marriage, then the witness Harriet could be the married Harriett Turner baptised in Chessington, and be the link that I am looking for.
A Harriett Turner married 3/1/1819 in Ealing (another of the Turner's stomping grounds) to one James Turrell. They appear to only have one child Harriet Louisa Maria baptised 25/12/1836 in Twickenham. James and Harriet b1836 are together on the 1841 census - which is as far as I have got. Harriet [nee Turner] must have died prior to 1841, but I have not looked yet.