Personally I thought it ridiculous IMO that Cameron flew Ryanair/Easyjet, because of austerity measures, it does not undo the need for the measures does it? Does Obama fly the equivalent of Easyjet? When he takes a holiday? No he does not. The PM has a social standing and it does not look good to other countries that he travels economy on one of the worst/crap airlines around.
Also security issues would need to be taken into consideration, I don't think he could stay at some of the hotels I've stayed at in Benidorm, and feel safe. 