Firstly, if you convert Pounds to Euros now and the Pound then drops, then the further it drops the better off you will be for later converting back to pounds. However, even if you sell Pounds now and instantly buy them back you will come out short because the trader will use different exchange rates for the two transactions - it is called a "spread" and that is how the trader makes his money. The spread may be of the order of 4%. Nobody knows what the future holds but looking back is easy - the Pound has been falling against most currencies for decades, sometimes sharply, sometimes not and occasionally it has recovered somewhat for a time, but on average relentlessly down. A year is so short a time that to take the chance would by most be considered a gamble. Look at "historical exchange rates" on the internet, then decide what to do.