I couldn't get the link to her Radio Two show to work, so I went to YouTube and found some of her TV work.
I think she is really attractive, but when I listen to her voice without the visuals, she does remind me a lot of Vanessa Feltz, and I can immagine that if she is freestyling, that she could be really annoying.
Some presenters manage to talk effortlessly, and you enjoy listening, others (Feltz, Parsons, Allinson) have nothing even approaching a personality or anything interesting to say - and i am willing to believe that NB would be one of those.