Hello Trish and Andrea, it's a long time since I was researching this Mead line, but yes I have Sarah married to John Dell, the Dell and Mead family are connected with my other ancestors the Faulkners.
Regarding William Mead the waters are rather muddied, there may have been 3 marriages, first to Sarah Rogers 1799, there was a daughter Elizabeth b/c 1801 in Chesham she married William Seymour 1830 in Chesham. William and Elizabeth Seymour were the witnesses at the marriage of William Mead to Lucy Holliman. A Sarah Mead was buried 6 April 1803 in Chesham.
William Mead married Sarah Butts/Bates Sept. 1803 Chesham, their children Sarah, Abel and William you are already aware of, I have no date of death for this Sarah, perhaps you would tell me if you have found this.
Brenda