We usually to bail the world and its mother out. It's only when we need to help ourselves there is no money, so yes I am sure the UK in any case will help out Greece. Whether the EU will, don't know. It will probably highlight the divisions that exist within the EU anyway.
I seem to recall some provisions in the EU against just this sort of a bailout (not sure about that though) but if Greece really tanks that might have some very negative consequences for the EU in general and for the Euro. With Spain, Portugual, Ireland, etc. lining up next it could really spell trouble.
But I'm far from there and wonder what those in the middle of it all are experiencing