Yes john, they have what is called a dual tax agreement. This prevents you from paying tax twice, once when you receive in in the UK and again when you transfer it to Greece. This is what the 'pink forms' are for, To certify you have already paid tax in the UK and therefore no tax is due in Greece. and fortunately this bit works. In theory , you should be able to select your tax base and pay tax where you chose but just ask the tax man in Britain if it's OK to not pay the tax on money paid in the UK and just send the money abroad and just watch that smile turn to laughter.
In theory you should be able to just buy a car in Corfu without residence permit and buy as many ciggies and as much alcohol as you like in any EEC country and drive across any border but as we know, these are at present only a theory.