I was all ready to tell you that rather than this Mark Sheppard person, we needed to get Crowley from Supernatural.
Ironically, I didn't see Sheppard as Binder in TC, but I did in SG. I blame the prevalence of him on all of my shows lately (last season's recurrence on White Collar; Supernatural; Warehouse 13)
I can't put the blame on that. Haven't seen him in anything since the Firefly series ('cause I have that on DVD). Don't watch TV. But he's been Binder since his first appearence TC for me. Wasn't just the British accent. I think it was Binder's style of sarcasm (similar to Badger's), and some of his expressions.
Sheppard's accent is kinda muddled, anyway--I can usually distinguish 'tween POMEs' and Aussies' 'cause two of my grandchildren have spoken the latter since birth.
But I can't distinguish in Sheppard's case. There seems to be a little "upward" inflection at the end of most sentences in Oz-Speak that frequently makes 'em sound like questions. Don't hear that in most UK accents, and don't hear it from Sheppard. But otherwise (at least in his 'Badger' role) he felt Aussie...