There are notable song workshops in the traditional style run by such as Chris Coe and I believe Sandra Kerr is the voice person on the Trad English Degree course
Vic Gammon is also a song person
I feel that traditional style English performers have a variety of 'tricks' and techniques and the aspiring trad style singer should listen to the recordings and absorb the differing techniques
Walter Pardon, Fred Jordan, Arthur Howard, Frank Hinchliffe, Sam Larner, Harry Cox prime examples of 'trad style ' singers UK
These are the ones from who songs can be learnt along with their methodology of how they are putting the song words first but using their own style of singing to accentuate and deliver the feel of the song by standing in the shoes of the individuals concerned
I do feel that a fair voice and range can be very helpful
Accompanying song musically is a different issue and has its own set of criteria