Spot on HPW and in much more detail than I could have described it. Cyevlin was still actual at Netherton during the fifties. One little amendment, (in case anybody wants to look it up), the word is 'cavel' - with an e, not 'cavil' with an i but I dare say there was a fair bit of cavil going on as well. It's a dialect word and follows the typical sound changing characteristics of the North East dialect. Compare cavel/cyevil with table/tyebil or cable/cyebil.
It came to Britain from New Zealand in the 1800's. I've no idea how or why.
What a wonderful resource we have here with the likes of HPW and Vic to answer mining qestions!