In a few words, PM Truss's first economic measures indicate that she's ideologically-driven and has no idea what she's doing. Namely, cutting taxes for the rich in hope that maybe some economic boost will "trickle-down" to the middle class and the poor. This idea is utterly discredited in economic circles. The UK central bank, the BoE, is forced to take measures to counteract what Truss and her government are doing !…
The bigger problem is the energy-price guarantee that Truss has announced that will put a ceiling on fuel price for consumers, with the difference born by the UK treasury - estimated outflow is more than 100 Billion pounds. This outflow is planned to be funded by borrowing, which has resulted in a weaker pound.
Reading https://www.bruegel.org/dataset/national-policies-shield-con..., the UK allocates about double of what France, Italy and Germany allocate to it.