Andrew Gilligan is something of a case study in how journalism works.
Gilligan's reporting on the Blair government's manipulation of UK public opinion in the run up to the current Iraq war initiated the events that lead to the tragic death of Dr David Kelly and the Hutton report - a moment of humiliation for the BBC. The furore resulted in Gilligan's resignation from the BBC and the first media institution to offer him a job after that was The Spectator, then edited by Boris Johnson.
Gilligan then went to work for the Evening Standard were he has lead the right wing media charge against Ken Livingstone and the Labour Government more generally. The Standard is a part of the Mail & General Trust Group along with the Mail titles, Metro and The London Paper and the whole group has a ferocious right wing reputation - especially the Daily Mail.
Gilligan who was forced out of the BBC by a Labour Government found a saviour in Boris Johnson and then went to work for the most right wing media group in the UK. This conjunction of events certainly stood Boris Johnson in good stead during the recent mayoral elections. Not least because the more racist side of Boris' public persona was somewhat swept under the carpet even though even Johnson himself finally twigged his comments were a bit dodgy.