actually the pound/dollar rate is more or less what it always has been for the past while(1:2)- one of the few advantages of the dollar performing as badly as the pound, lol (EDIT: just checked and the pound seems to have slipped a little against the dollar- that must be pretty recent :? :x ). it's the pound versus yen, and pound versus euro, where things seem to have slipped very badly- certainly the euro used to only buy you about 65p, now that's more like 80p (which affects prices on thomann etc.), and when i got my edwards a pound bought you around 240yen, when i checked yesterday on xe, that was down to 190 yen, which is quite a difference! it had actually started to recover a few weeks back, but it seems to have slipped even further again.
another very important point that philly mentioned is that it could get worse- and certainly with ishibashi you normally have to wait a few weeks until they've got one they can send out, and they won't charge you till you get it, so you could end up paying more than you expect. I'd hold off for a while to be honest.