News diary 21-27 January: Chris Evans makes Virgin Radio breakfast show debut and Prince William interviews Sir David Attenborough at Davos 
LBC radio presenter who served as Downing Street adviser 'shared questions with Cabinet Minister ahead of interview', report claims 
Diane Abbott claims BBC whipped up 'hostile atmosphere' against her ahead of Question Time appearance 
Chris Evans Breakfast Show on Virgin Radio will be ad free under new deal with Sky 
LBC chief correspondent Tom Swarbrick joins Theresa May PR team as head of broadcasting 
