M.Ted

given that the British Folk revival seems to have revolved around this sort of thing All Around My Hat

No it didn't. Look at the dates. As Frank points out, this is a bit of folk pop and, as such, stands up pretty well. (The moustaches are a bit embarrasing I admit. I probably had one like that myself.)

Stringsinger

What about Lonnie Donegan?

An English member of the American folk revival. Your point?

Then there were these Teddy Boys from Liverpool.

And very good they were too but I don't think they claimed to be "folk".

Are you saying that Pete Seeger is "folk pop"?