Just as a warning, the microfilm records for St Nicholas' for this period are, for the most part, almost unreadable. Most of my Brighton lines end during this period because the records are so difficult to read. I've spent many a frustrating day sitting trying to decipher even the odd name, to no avail.
There are transcripts for all dates up to 1770 and for all dates from 1813, but no-one looks to have been brave enough to try the intervening years.
Not trying to put you off, honestly. You may be lucky.
Glen