Patron Sheets are a waste of time. They are not going to give you
information that can help you; probably they are going to confuse you. LDS
does not double check the patron sheets but accepts everything at face value.
They know that they are incorrect but do not correct them.
I had that brought home to me many years ago. I have an ancestor named John
Evans who was married to a Sarah about 1834 in Llanfynydd parish, CMN. I
found in the IGI a record of a John Evans marrying a Sarah Edwards in the
right parish at the right time. It was a patron sheet, which I ordered and
found the entry. So I double checked the entry. The person giving the
information did not have the correct film number for Llanfynydd. When I
looked up the actual entry, what did it say: "John Evans married ESTHER
EDWARDS." Nowhere did I find a Sarah Edwards. I'm still looking for the
marriage record all these years later.
Also, be aware of any IGI listings that relate to a "will." Don't waste the
time looking them up, go and look up the actual will itself.
Most of the IGI is not checked by LDS and never will be. It is only an index
into their records.
IF you want to know about the IGI in more detail, read the Chapter on the
"IGI for Wales" by Chris Pitt Lewis in the Second Edition of Welsh Family
History: A Guide to Research, edited by John and Sheila Rowlands and
published by the Federation of Family History Societies, Birmingham, England.
You can buy the book on the internet thru Amazon Books, Barnes and Noble and
others. Read the chapter before you go too far in using the IGI.