This blog has over the last few months outlined a couple of ways of leaving the euro, including the "orderly exit" and the "emergency exit". (Probably only Germany could get away with using the orderly exit, everyone else would need to head for the emergency exit.)
And now there's a prize if you can work out how a country could leave the euro. Lord Wolfson, CEO of Next, has put up a quarter of a million quid for anyone who can figure out how the deed should be done. Actual admin of the prize will be by the Policy Exchange think-tank.
This is slightly weird. Is he desperate or something?