Greg,
One should never quote an entry from the IGI without qualifying it as being either submitted or extracted. Submitted entries have no provenance so should be disregarded without documentary evidence from elsewhere. The source call number of the data given with extracted IGI entries is the film number of the church records from which the data come.
However, although the IGI entry given in Batch No. C073321 for Joseph Bugden son of Tho (Thomas) and Ann has the message that it was extracted, it gives no Source Call No. which is most unusual so I researched a little further and I now consider an error exists in the LDS library catalogue.
Checking the catalogue for Wilton and choosing the Wiltshire England entry, gives nine choices among which are, "Church records" and "Church records - Indexes".
Choosing the latter gives two, "printouts" which are in fact the files of info. of the IGI entries one may access on-line in the usual manner. Choosing the second printout gives batches 073321 and 073324. Those batches of data were extracted from film 1279341 items 1 - 13 of which show Wilton parish registers 1615 - 1960 so I presume that there are no earlier church records.
The batch numbers appearing in the HW site
http://freepages.genealogy.rootsweb.ancestry.com/~hughwallis/IGIBatchNumbers/CountyWiltshire.htm#W for Wilton are C073321 - baptisms - and M073324 - marriages.
Extracted entries in the IGI are acceptably reliable extractionwise.
Now you have a real problem
Regards
Chas
