I agree with other posts about the beeb recognising and incorporating English Traditional Folk Music into the Proms, psrticularly since Percy Graigner was one of the first to appreciate the choral and orchesteral potential of this previously overlooked genre.
However, I think that it will have truly been acknowledged when The Wilson Family are booked to finish off 'the last night' with their unaccompanied rendition of The Miners Lifeguard in place of Rule Britania/Land of Hope and Glory - it'll never happen but there'll be many out there who wish it would!