From Robert Peston's blog (Business Editor for BBC).
I like Robert, he is very switched on. I have picked out a couple of quotes from the last section of this article.
But what if the worst happens? Is there nothing that the UK authorities can do?
Well there is an extreme remedy, which policy-makers have muttered about to me.
It could purchase a sizeable amount of British government debt and then announce that the debt was being cancelled, that it never needed to be repaid.
It would therefore be dropping cash into the economy, it would be pure helicopter money, to use the phrase beloved of economists.