The actor involved has a great and I'm sure you'll all be pleased."
Has a great what? I'm not sure, but I think Roger means he approves of the choice.
Still trying to work this one out. It occurs to me that this might not actually be a typo, and Sir Roger's comments might have been deliberately edited because he gave too much away about the new Saint's identity. For example, Sir Roger might have said that the actor involved has -
A great problem keeping it in his pants. (Jude Law)
A great big pair of man boobs like me. (Cary Elwes)
A great wardrobe of frilly knickers. (Eddie Izzard)
A great deal of trouble standing up on St Patrick's day. (James Nesbitt)
A great deal of trouble standing up on any day. (Colin Farrell)
A great amount of contempt for just about everything. (Hugh Grant)
A great capacity for putting stuff up his nostrils. (Steve Coogan)
A great passion for grannies. (Ralph Fiennes)
A great mop of hair like a bog brush. (Rufus Sewell)
A great collection of barbie dolls. (John Barrowman)