well not if the banks step in. however i will put this forward - the interest rates in the uk are much higher than they are here in th U.S. so chazola could make up his pereceived 'loss' of selling usdlrs for gbp by a better interest rate return on gbp.
anyhow it all depends on the situation. if you don't need the particular currency right away then you could hedge the exchange rates movement by holding some usdlrs, if you are so inclined, for use on say a future trip to the u.s.

after all the biggest spread in rates i have seen in my life for the gbp is only about us$ .60

currency trading for profit is for the big players, not the little guy.

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1984 300D Turbo - 231k....totalled 11/30/07 RIP