LOL, Truss was in office for no time & she is being blamed for everything.
As for transitioning from fossil fuels.
1) It's not necessary to do this at the pace intended for any reason, the pace is insane.
2) Nuclear power which is much more sustainable is being neglected, I think we used to generate ~25% of our load from Nuclear in the 1970's, now its more like 10 to 15% (I'm not sure how much of that is due to a decline in capacity or an increase in demand).
It is reliable base load. EDF/UK government are building Hinkley Point C (3.2GW) & Sizewell C (3.2GW). Hinkley Point is currently projected to finish in 2029-31, but I'd be willing to bet it won't make 2031.
Furthermore a number of older reactors are due to be decommissioned in the next few years.
This paper is useful for background.
https://researchbriefings.files.parliament.uk/documents/CDP-2024-0036/CDP-2024-0036.pdf
As far as I can see the new projects don't add enough to capacity in the long term, 6.4GW of less whatever is decommissioned to demand that peaks around 47GW on average in winter.
3) Solar and Wind are immature and unreliable technologies, solar isn't very appropriate for the UK climate, practically worthless in winter (I've got solar panels, I've seen it for myself).
4) Energy storage which would make wind and solar power sources far more useful is so far inadequate, either in the technology or facilities available. As it stands the capacity is about 1.2GW and clearly when it discharges into the grid there is a delay before it's available again though I guess they will recharge them overnight. There are however a lot of schemes in the pipeline.
5) The transmission infrastructure is inadequate, do you know the UK pays approx. £2 billion p.a. to wind power generators to disconnect from the grid when it gets overloaded, also much of the generation is too far away on the wrong side of transmission bottlenecks to be used.
6) Regarding security, if you had any idea you'd realise most days the UK imports 10% of its electricity from France, Norway etc and all the gas is imported. Wind and solar generally only contribute a fraction at the moment and gas takes up the load as it can switch in and out swiftly.
7) The idea a struggling grid can supply enough electric vehicles and other increases in demand while replacing petrol and diesel transport is impractical and dangerous. It is far too premature to start banning new internal combustion vehicle sales (if ever), I think Miliband is going for 2030 again, I'm fairly sure it will be set back before then.
8) It was folly to destroy all the coal fired power stations. Some should have at least been mothballed. Ed ordered the last one be decommissioned/demolished quite recently I think.
9) Most UK households are heated by gas fired central heating which for most of us constitute ~80% of our energy usage. I hear the politicians wish us to install heat pumps but that idea has many flaws, their expensive, they are inadequate for old houses and they're noisy. I certainly have no plan to move away from a reliable gas fired system, have you?
Gridwatch is useful to see the current and historical demand supply situation.
GB Fuel type power generation production
It's not all doom and gloom but I think Miliband is taking too many risks for political not practical purposes and the bill payer will suffer, we might even get brown outs from time to time, I hope not but I wouldn't bet against it. Expensive energy does not help the UK economy.