Spurn any feeling of Shadenfreude that Greece's parlous economic state may engender and forget any prospect of the Euro collapsing; the EU's grasping tentacles have a claim on the UK to subsidise failing eurozone economies, despite our not being in the eurozone, and it's decided by majority vote. The Germans may soon be standing on the doorstep asking us for £5bn. And if Spain gets in on the act, it could be a lot more.
A Prime Minister with even a hint of spine (that's courage, Gordon) would refuse to pay; it's their euro, let Germany bail them out. Except the Germans are unwilling to spend their own money - they want to use ours.
The alternative solution is an attractive one. Let Greece go back to the drachma and Spain to the peseta, allowing them to savagely devalue their currencies, go back to being poor and making their countries affordable holiday destinations once more.