I have come across relatives who married a former spouse's siblings but no consequences that I know of.
On the first marriage, I notice that Sarah was a witness to the marriage in the parish church in Whaplode.
There is an announcement for the second marriage in the Stamford Mercury on 6th December 1861.
"At the Free Methodist Chapel, Holbeach, on the 4th inst., Wm. Hunt, widower, of Whaplode, to Sarah Taylor."
It sounds as though the vicar was annoyed when reading it.
Again, I can't find anything other than the newspaper article.