Benhall Street and Benhall Green are just to the immediate south of Saxmundham. Both Benhall and Sax came under Plomesgate Hundred/Union.
One of the Sax charities paid for poor boys of the town to be educated at Benhall school.
Bentham might well be Benhall.
Benhall parish church is St Mary and the PRs have been filmed.
Saxmundham St John were not filmed due to a ban by a previous incumbent - but although the Suffolk Record Office web site says that permission has not been granted for filming, a fellow researcher assures me that the ban has now been lifted and the PRs for Sax are now more readily available - needs checking out.
Benhall is on the list of parish look ups at the Suffolk Look Up Exchange at
www.suffolk-surnames-list.co.ukPat ...
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please PM if interested).