Leila,
Apart from Bradfield TMW which has traditional singers and revival singers from all over the British Isles, you might like to check out particularly Shepley FF and Whitby FF both of which have traditional Yorkshire singers booked this year. The songs on the YG website are just a mere sampling of the repertoires of our esteemed Yorkshire traditional singers. The most noted hotbed of traditional singing in Yorkshire, arguably the whole country, is the Pennine area to the west of Sheffield where until very recently there were thriving communities of singers largely independent of the folk revival. Other than that there are other isolated singers still struggling on in other parts of Yorkshire, possibly most notedly John Greaves who is trying to keep alive the N Yorks Eskdale repertoire. John and the west of Sheffield singers can be heard at the above-mentioned festivals and on the YG website.
Of course there are many Yorkshire singers of traditional songs and lots of these are already represented on the above-mentioned website.