Thanks again, Galium.
It's definitely St Michael's, and there is a contemporary record of a tombstone being ordered (from a Thomas Holdsworth), but it may not be still there or still legible.
The link you gave me is a very useful website; unfortunately I can't get the email link to work for me, but as there are just a few MIs listed on the site, it doesn't look as though the whole churchyard has been recorded.
Thanks again,
Lesley