Mears, yep, the big boy scout would be a must.
I would also take Gordon Ramsey. Apart from all his Effing and Geoffing he's a good leader so would keep everyone in order, even mears, and every night you could sit down to a gourmet meal with all the food mears has found during the day. He's also a good footballer so after mears has fashioned us a ball from whatever he can find, we could have a kick about and put Mears in goal.
So that's two down. I would also probably take Will Ferrell, although seemingly big and useless he's be good for morale with his comedy.
Andy McNab for security and military skills.