It's funny, the hardest thing to do is to make something look like it's fast, loose and improvised, and get somebody to laugh.
A lot of times black actors get stuck in a box. They're up against a lot of limitations for the kind of films that they get approached about. It's easy to get stuck in a box and just be approached about nothing but urban films.
In dealing with Englishmen you can be sure of one thing only, that the logical solution will not be adopted.