From WALES ONLINE:
What does his mumbling have to do with it?
Oh, dear. That is so obscurely British that I haven’t even the faintest idea what it is about.
“Freedom of Swansea” seems to be a goal one gains — something like the World Cup, perhaps?.
“Swansea Valley” seems, logically, to be a geographical depression.
And is a “Swansea Mumble” a local dialect perhaps?
Sort like the keys to the city, the particular city being Swansea and the “mumble” is of all things a newspaper.
No doubt about it, the US and the UK are two nations separated by a common language.