Bowerboy,
The marriage info. you found was allegedly extracted from the records of St Sephen (that should be St Stephen) but the surprising thing is that the Batch number M019972 has no Source Call number. Searching the batch number with no names in the name search fields will give all the entries in the batch

Source Call numbers identify the LDS film from which the info. was extracted and are essential if one wishes to check church records via LDS films. The Batch seems to cover the years 174? to 183?
However, the LDS has filmed but appear not to have extracted the info. from Film number 1595986 showing the Bishop's transcripts of St Stephen's registers for the years 1671 to 1864. You could check that film if you wish to verify what you've found but it's possible the film could have been the one from which the batch was extracted but I doubt it in view of no "twin".
Unlike many M batches which have corresponding C batch identifiers giving baptisms/christenings, the one you found appears not to have a C batch "twin". Are the LDS trying to make our research more difficult?
Thanks for finding this batch number, I'll add it to my list.
Regards
Chas