Primitive Methodists (General)
This may be the site ?.
http://www.archive.org/details/primitivemethod00varigoog
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.