Basically the proposed tax cuts, as they were completely uncosted, caused the markets to freak out; the pound crashed to an all time low, yields have gone way up, and there was a run on mortgages that could have caused mass insolvency on like 45% of mortgages in the country.
The bank of England had to intervene, which they did to the tune of £60 billion. The IMF also chewed out the government for being irresponsible.
I don't have much of an idea for narrative yet, so it would be a mechanical thing but it's useful to put the system in the hands of actual players and see what they do with it.