It looks as if you took the exchange the wrong direction. £6.00 figures out to $11.15. As of today, 1 USD = 0.538261 GBP.

Having just come back from Scotland a couple weeks ago, I am painfully aware of the dollar's poor position. <sigh> I still had a little over £125.00 when I got home and I didn't even bother going to an exchange window. I figure it will just lessen the pain that little bit, the next time I am across.