Nobody gets paid, or they'll get paid with newly printed money that renders the currency even more worthless. Benefits dry up as government coffers are emptied and there's no credit available to make up the deficit. The rich flee to the Eurozone, Hong Kong etc. Public services crumble away to nothing. There's either a massive rise in crime or we get a police state or, most likely, both. The army is called in to crush mass land seizures. Bailifs and debt collectors become increasingly violent in seeking to call in every scrap of debt in the land so some traces of liquidity can be maintained. Riots, and lots of them. Etc etc etc.
I'm looking forward to it. We will soon see the state's true colours and I will have a long-awaited chance to say 'I told you so'