The publisher of Damian McBride's memoirs is facing questions from police after tussling with a protester as the former spin doctor gave a live television interview.
Iain Dale, of Biteback Publishing, scuffled with Stuart Holmes on Brighton seafront as he tried to get the veteran campaigner's anti-nuclear banner out of shot.
Sussex Police said this evening it was "seeking to interview a man in connection with an assault".
Mr Dale, writing on his blog, said the protester - a familiar face to conference-goers for 30 years - was an "idiot" and said he had only done "what any self-respecting publisher would do" by stepping in.
More top news
As Jeremy Corbyn prepares his speech for the last day of the Labour conference, he can reflect on tightening his grip on the party.
The Duke and Duchess of Cambridge were snubbed for a second time in two days on their visit to Canada by a prominent First Nations leader.
Scientists found their skin cells have a built-in protection, meaning they are more likely to be blessed with long-lasting youthfulness.