Henry, I had the pleasure of my friends from the U.K. visiting my wife and I here in Houston in May for a while, and he introduced me to the word, "Numpty." Hilarious.
Great word to use here in the States, nobody knows what it is, so you can fling it about with impunity. Until they ask, that is I suppose.
I did like this T-Shirt from Dan Rubin - I am sure that your English friends would find it as funny as I did -
Dan Rubin wrote: View Post http://www.slanjkilts.com/vmchk/Leis...y-T-Shirt.html
Co-author `Positive Aikido`