It is not something risible. The default of a economy as big as the Spanish would probably drag others. And Britain is in as bad economical shape as any South Mediterranean country, although devaluation of their currency has hidden it for a while.
We are facing a chain default of big economies. No one would be unaffected.
Even the very plausible loss of the UK's AAA status is fine by me (I am a UK citizen).
Socialism breaks down. The important thing is to let it.