This is a British gold Sovereign. First introduced in 1816, it became the world's most widely used gold coin. Today it is still legal tender in the UK. That makes it the most portable tax-exempt method of defending your money.
Again I'm grateful for the following educative interview recorded on YouTube (link below). Do have a listen to it. And don't think for one second that just because they are discussing events across the Atlantic it isn't relevant here; it is. For me the most outstanding comment is that we are all "dreaming". Fiat "money" isn't going to be here for ever. Some form of default will occur. That could just be by inflation, probably our government's preferred route. For Greece, it might be different.
At today's date, you can pick one of these up for about £240. Buy one every month for the foreseeable future and put it somewhere safe.
http://www.youtube.com/watch?feature=player_embedded&v=MuS6_M4cQOM