In 2010 the UK had a debt comparable to Greece's at the time. We have turned our country around by tough decisions and sticking to a long term economic plan. I am afraid the same cannot be said of Greece. They have been bailed out by other Euro zone countries [not including the UK, as the Chancellor took us out of the Euro bail out zone] on a repeat basis. But they refuse to cut their costs. The maths are simple. If you repeatedly spend more than you have, and have no plans for alternative income or the ability to get yet more borrowing then you will go bust. Greece is literally running out of money and refuses to take any action. It's exit is a certainty in my view.
http://www.telegraph.co.uk/finance/economics/11543730/Grexit-dangers-mount-as-Greeces-Yanis-Varoufakis-warns-of-liquidity-asphyxiation.html