Hello bonehunter,The Bog is a place near Pennerly, Shelve . There was a lead mine there with some houses and eventually a school which is now an information centre and very helpful it is.
The registration district is often put as Forden,perhaps this may help you.
There are records at the school/info centre and pehaps if you write to :- The Bog centre
The Bog.
Pennerley.
Shropshire . Someone may be able to help you. Enclose a S.A.E. as it is run by volunteers.
Hope this is helpful. Viktoria.