Oooh - one of the scanned wills on SEAX is a will of Robert Butcher in St. Osyth in 1710. It's perhaps a bit early, but it might give some clues? But no Butcher wills in Great Oakley (that is, on SEAX - they might appear in the red books they have which provide indexes for the wills on microfilm - apparently those are the registered wills, so although there is a lot of cross-over with the wills on paper in the archive, if the paper will is lost, it won't come up on SEAX but *will* be in the red books. Drop them an email to ask. You could ask for a scan from the index of all people with the surname Butcher, which will give you locations to search for as well. It's what I do with some of mine if I'm stuck. Of course, not a huge proportion of people leave wills, but they've broken down so many walls for me, that it's my next calling point after parish registers, or used in combination with...).
Then of course there's the ESfFH Poor Law CD. That's quite good, if you're lucky (?!) enough to have an ancestor make an appearance in an examination or what have you.