Because, other than being American, the combination is about as far removed from an instrinsically English cultural stereotype as you can get. As is George Best, a sozzled Irish (Catholic, I think) "sports personality"). It is merely a further illustration of just how off-topic the OP strays in the entirely hopeless bid to validate a non-existent point.

Coincidentally (and uninterestingly), both Sid James and George Best feature in the list of Peggy Mitchell's exes.