ferris use p&o ferries where it is better to use sterling than euros.
the prices are not that cheap on board, but if you are going to eat a hot meal on the ferry then it is often a good idea, depending on how hungry you are, to go to the proper restaurant (langnans brasserie?) rather than the self service restaurant which can get very busy.
another tip for you with ferris, is that they stop around 6-7am on the saturday for breakfast, but you are only around 1-2 hours from your hotel by then. if you can last till then, you are better waiting until you get to your resort, dump your cases(because you wont get straight into your room) and go round to bar street -near the papi hotel and get a proper english breakfast. almost all the bars are open at 9am, and most do a decent breakfast -legends and the eureka are normally very good.
re the euro, i cannot predict what the rate will be, i could be very rich if i could, but i have found that i get a better exchange rate using the ATM than by changing cash or getting euros here. you also get a reasonable rate in the tabac in bar street, or the one near the alhambra hotel.
we are going to spain in june by ferris coaches .we have never been by ferry ,when we are on board the ferry and we want to buy food i expect we buy it with euros not pounds .am i right in thinking that. 
.the euro is still rubbish i know no one has a crystal ball but would we be better waiting till we get to malgrat to get our money or get the euros before we go .when we went to greece last year they were doing good rates in greece .is it the same in spain usually .thanks for all help . 
