By Laura Armstrong James Haskell is being urged to scrum on down and sign for Celebrity Big Brother. The rebooted show is due to start on ITV in March, and bosses are keen for the ex-England rugby star, 38, to appear. If a deal goes through, James – who split from wife Chloe Madeley last year – could be rubbing shoulders with the Princess of Wales’ uncle, businessman Gary Goldsmith. The brother of Kate’s mum is understood to have promised no subject would be off limits if he entered the CBB house. James is said to have already met the casting team and is in advanced talks to get on board. A so…