Interesting thread, check out EII who in various line-ups have been fusing Reggae and folk for 20 years.
Over the years I've played with lots of Afro-Caribbean, African and Asian musicians and in all these Bands I've introduced a certain European trad element.
The most mixed Band (stylistically and ethnically) I play in is the Suns of arqa, where I play Whistles, Bombard and Highland Pipes. We gigged extensively in Europe and the UK and played at Glastonbury a couple of times.
Having said that in the 20 years or so I've been a musician, I've never met any "Black" people involved in the Pub tune session scene.
That does not mean they're not there of cause, but I think the numbers must be very small.
I don't think this is a desirable situation for a continuing tradition but it is most definitely not due to the attitudes of the vast majority of the people involved.

TTFN

PP