Mark Radcliffe has been on the radio for a long while now. He is a music enthusiast, and has always tried to provide interesting music on shows he has presented. Some people will like his personality and others will almost certainly hate him.
As for credentials, he has been the singer with The Family Mahone, a band in the style of The Pogues (At Cropredy - Radcliffe is in the white jacket and straw hat).
He has also presented shows from the Cambridge Folk Festival for a number of years.
On his non-folk radio shows, he regularly has played folk music, and also had folkies in the studio for chat and live songs. I seem to recall hearing Gary and Vera Aspey on one occasion and Bernard Wrigley on another.
His general attitude to presenting is somewhat irreverent, but he has a sound knowledge and love of music.
I think he will do a good job of it.
Quack!
Geoff the Duck.