http://www.engleseabrook-museum.org.uk/history.asp

The best collection of PM materials is at the Archives of Methodism in the John Rylands Library in Manchester. I have been there to compare different editions of their early hymn book. When it only contained sixty hymns, over a third were from the American camp-meeting movement; sixteen were by one rural preacher from Tennessee. This lapse of poetic taste was corrected fairly soon, mainly by Hugh Bourne; but the original hymn collection (brought over by Lorenzo Dow at the end of 1805) was informally kept in print by Dow's admirers in Ireland -- not necessarily affiliated with the Primitive Methodist Connection -- at least into the late 1820s.

To be fair to my grandparents, they didn't embark on the subject until I had been marched to a circuit choir rendering of Stainer's "Crucifixion" at Pillowell Methodist Church, which had (and maybe still has) the words "Primitive Methodist" in its stonework, and I had queried the word "Primitive." Apparently all such manifestations of faction were supposed to have been eradicated, but it didn't always happen.

My sister has a bible presented to my grandmother's sister (Miss F M Sterrey) when she moved away from Lydney in 1912. It is inscribed by my grandfather as Sunday School Secretary, and the inscription studiously refers to the church as "Primitive."

The Hill Street church is long closed, but I visited Springfield in September 2011 to see the pulpit King James bible presented in my grandfather's memory in 1962. Numbers there may not be huge, but it is a modernised and well-kept chapel that I wish well.

Given such circumstances and a reasonable fist at archiving, there may well be stored magazines of "Prim" chapels in the Forest which would throw light on the Primitive Methodist emphases and maybe the differences from "them Wesserleyans," as well as the material giving rise to this thread.

I haven't used a specific website for this -- I did a google search for the Primitive Methodist Magazine and included the names I was interested in in my search string. It appears that a goodly number of issues of the magazine have been stored as google e-books, and are searchable.

If you click on the B&W page to the left, after it loads you can read, search etc.

Certainly I've found this and other US sites very useful, amongst other things I use it to read the Phillimores Parish Marriage Registers rather than buy the cds.
Searching "Gloucestershire" gives the following;
http://www.archive.org/search.php?query=gloucestershire%20AND%20mediatype%3Atexts

Or searching "Forest of Dean" gives;
http://www.archive.org/details/cu31924028028920

Hope this helps.

They are included as on line books, and not always the easiest to navigate, but if you get a "hit" it is well worth putting the time in to find the content you are seeking.