[tialaramex]

Gilt yields. Truss' government will need to borrow lots of money since it intends to "grow" the economy by just giving the wealthy more money [a plan the market knows doesn't work]. This is done by auctioning bonds, which then trade on a secondary market. The UK's government bonds were once all issued as physical objects literally gilded with metal edges, hence "gilts".

In effect what is on offer in these auctions is a government promise to pay a certain amount of money at a set time in the future. Bidders say how much money they will pay now for that promise. For example maybe the government wants to pay £105 in 2050, and the auction just settled at £86 and I was a bidder, I pay £86 now, and I get a promise to pay £105 in 2050. The governments gets £86 now which it can spend, but needs to find £105 to pay me in 2050 (Hint: It will just issue more gilts).

Gilts are a bit more complicated because they have index linking and there's a whole coupon mechanism so you get a little bit of the money back periodically, but this gets the basic idea across.

The exchange rate stuff has a more immediate impact because it causes import prices to jump, but the gilt problem is actually what means you shouldn't ever do this. It's like using credit card debt to finance a fun ski holiday versus to buy a car so you can drive to work. One of these things is reasonable, albeit not ideal, the other is just throwing away money. Unfortunately it isn't Liz's money, it's the nation's money, increasingly it's the money of those least able to afford it.