You Englishman are funny chaps I must say. Btw, Harry don't worry about it, it's a harmless mistake. I'm sure you did not mean any malintent by it, not like you offered peanuts to someone with an allergy (now that would be offensive).
Uhoh. Did you just call a guy from Wales an Englishman... -- this could get ugly.
But, hey, that could be a great tactic to employ if you ever play a tournament in Wales and want to throw off most of your opponents.
Play air chess. Hover your hand over the piece you want to move, and move it over the destination square. Then, about ten moves in, start making imaginary air sacrifices.
Seriously, though, if your opponent is in time trouble, or has taken a long time over one move, when you see that he is about to move, get up and leave the table. This almost inevitably sends him into another thinking session. Try it, it works.