in chief of the sun. helen lewis, writer at the atlantic, you know, first up, can you just clarify how normal is it for a journalist to move between journalism and politics like that? well, it s enormously common in one - direction, moving from journalism i into politics, if you think - about the fact that, you know, david cameron s spokesman was craig oliver. you know, this is not. labour had seumas milne from the guardian. - you know, this is not l an unusual thing at all. what s slightly more unusual in this case is moving back. again so quickly. and that, i think, is the thing that makes it very hard, - because people are inevitably asking, hang on a minute is the sun reportingl this with one hand tied - behind its back because its own hierarchy are involved in the story? - and that can be very difficult as a kind - of conflict of interest thingi to square, but also the way through this. you know, borisjohnson- is a formerjournalist himself. he has great contactsl in a number