He is an Old Vic shakespearian actor amongst other things. He will be missed, one of the best characters only. Apparently leaving as he wants to diversify again. I can't say I blame him. Just realised last night what absolutely beautiful eyes he has.
I thought he was ridiculous when he first started, but grew to really love his character. A fine actor - Shakespearean nonetheless. That Xin character won't be missed (though the actress herself is very beautiful - I saw her on Loose Women and was knocked out by her beauty), but the character of Graham certainly will.
I once caught a glimpse of "Becky" being interviewed and was bowled over by her grace, elegance and beautiful diction. To me that is the mark of a good actress.