I vaguely remembered that Sean Burke, one of my oldest friends, got a shout out from the OED when the Welsh word cwtch was added, and indeed I was right. Google led me to this:
Our job is to record the language. And we found the word cwtch was turning up more and more.
Part of the reason is there has been a spate of writing which recognises Welsh-English as a legitimate dialect, such as Sean Burke.
Quite so. But there's more. An earlier, less perfectly honed query led me to this page.Mate, I have known you since infant school, but that Sean Burke is gone from me now. Henceforth you can be nothing but Flex Rumblecrunch.