I have had a reply from Lichfield. They have found wills in the index for 2 of the remaining people:-
Thomas Charles (buried 1834) - of Abbots Bromley, probate date 23/4/1834
Joseph Charles (buried 1767) - of Abbots Bromley, probate date 13/8/1767
They found no wills for the other 2 people.
I think this completes this post.
Thanks.
Liza