I'm not English, so I hope you don't mind a little American intrusion here ..... I would think the Rummel Pot and the Gridiron should get some honorable mention, as well as the tongs and key ...... actually, I've built several Rummel Pots and used them in a family band many years back ..... got lots of attention ..... and laughs.

Maybe this would help your search: Old English Instruments of Music
By Francis William Galpin - (a readable book online)
http://books.google.com/books?id=0dwPAAAAYAAJ&pg=PA259&lpg=PA259&dq=%22gridiron%22+%2B+Old+English+music&source=web&ots=YVOUjH8Mq0&sig=SS_1fidxZMQ0Fa8d3FqcV2XLdyM&hl=en&sa=X&oi=book_result&resnum=1&ct=result#PPP1,M1