I've just spotted the 'Cow and Church' series, OX3BM51 is one of them, around Honeybourne.
This seems to be the same as the GC.com series of the same name, GC3BM5Z.
I really like how you can group caches on Opencaching.com - it says 'part of series...' on the listing. By clicking on this it takes you to a new page with all the caches in the series listed. I suggested something similar to GC.com five years ago and nothing so far
I think this should be put in place as a possible alternative for Bookmark lists, as in it's something the CO manages, perhaps with the whole series summarised on the page. Opencaching.com seem to already have something similar in place
Just out of interest, for anyone who has found this series on either site, would you consider logging it on the other as well? Or perhaps you've claimed the caches on both sites already?