I have seen him fight against Charles Brewer and Julian Jackson. Against Jackson he was winning and doing great, he affected Jacksons eye, but then he got caught by a great punch. Same against Brewer, Brewer just unloaded on him against the ropes, where before Graham was doing good.
Not that it means much to this discussion, but I did some basic body sparring with him while back home in Sheffield (where he's from and lives now). Only person I've ever come up against of that level, it was an enlightening experience to say the least!