'However, when I see such as George Michael and Eddi Reader performing 'folk' music, I am surely entitled to reject such an offering.'

That seems extremely narrow minded of you. Eddie Reader (whose singing as I said earlier I am not keen on) has a great interest in folk music. Not sure about George Michael but perhaps he has. There is no reason why folk songs should not be sung by singers who have previously been, or who are currently, involved in pop music. There were a large number of well respected folk singers involved in the programme so to say 'such choices of performer indicate how little the producers know about the music in question' is quite frankly ridiculous

Your loss if you do not choose to listen to such excellent programmes