you have a lot of checking to do then as there are numerous Methodist chapels and about 45% of Manx were Methodist (post civil reg baptisms were a private matter between church + parents) - your best bet is to check the BMD's of the local papers (microfilm at Manx Museum or I think UK national Newspaper Library at Colingdale, N London) - if you find a ref here go back and ask General Registry to recheck - they have been known to mislay the odd record before.