Also worth noting that there's been a lot of detailed modelling of potential energy systems for the UK, and there's not many that don't have a big chunk of nuclear in their optimal mix.
Big nuclear does have huge upfront costs, but it does have a very long life and reliably steady outputs.

You might be able to retrofit every suitable home for that sum, but making a functional grid out of it would be the big challenge.
I suspect the politics and logistics would also be a lot more difficult than one would hope.

One interesting point about the new financing arrangement is the return of Centrica, who originally had a 20% stake in the HPC/Sizewell C venture. They pulled out in 2013 citing uncertainty about overall project costs and the construction schedule (with some justification).

Hate to say it, but that is somewhat unfair. The delay was mostly due to EDF not committing. The principle that the government wouldn't invest in new nuclear was set under Blair and Brown.

And a bit more detail in the Clean Energy Industries Sector Plan
-
www.gov.uk/government/p...

Not much that’s groundbreaking, but a lot of fairly sensible steps.
The measures on electricity costs should be a stopgap, pending a revamp of price-setting mechanisms.
The challenge now is to ensure that this Industrial Strategy has a longer life than previous versions!

Advanced manufacturing is also one of the IS-8 priority sectors, with batteries and advanced materials among the target markets, and strategic support for the steel sector and critical materials.
Also the usual mix of R&D funding, skills investment, and support for automation.

A few highlights for manufacturers:
A new £1 billion Clean Energy Supply Chain Fund, to be run under Great British Energy, with £300 million to support domestic capabilities for offshore wind.
A further round of the Heat Pump Investment Accelerator to grow manufacturing capacity.