Sir Paul Stevenson said No.10 told him not to reveal that Neil Wallis (ex- News of the World Deputy Editor during the hacking) was working for the police.
John Yates says he offered to brief the Chief of Staff at number 10, Ed Llewellyn, in September 2010 on the nuances of the phone hacking investigation. He declined the offer.
This is why Cameron should not be away galavanting.