A minor point worth noting is that the keyboards in Greece are American, not UK. You can recognise this as the Shifted 3 key has the # symbol on it not the £ symbol. This is not a big problem. You can change the keyboard to the UK layout but when you do this Shift 2 becomes the " symbol, instead of the @ shown on the key itself, and Shift ' becomes the @ symbol, instead of the " shown on the key itself. Confuses visitors no end who ask to use your computer to access the Internet.
Filippos is correct. Buying in the UK is fine as long as it keeps going but a pain in the neck when it goes wrong. If you do decide to buy in the UK make sure it is from a firm that gives a long "collect and deliver" guarantee that applies across Europe. This might be hidden in the small print SO ASK!