Nick Robinson - an interesting choice of words

The BBC's Nick Robinson has an interesting choice of words in his latest piece entitled "Back-slapping". The article begins:

"There will be much back-slapping in David Cameron's office this afternoon.

The Tory leader has struggled to get much attention for his call for a general election to elect a new Parliament to go along with a new Speaker. This, despite the fact that he is working in partnership with the Sun. "

"Working in partnership with the Sun"? I Assume he means "The Sun" newspaper rather than the Sun (the star at the centre of our solar system) but if so that is an interesting accusation to make - "in partnership". Why does Nick Robinson think this? Who has told him this is the case? Is it true or is it another case of Number 10 paranoia?