"...according to the Climate Change Committee (CCC), UK low-carbon investment each year will have to increase from around £10 billion in 2020 to around £50 billion by 2030, continuing at around that level through to 2050..."

That extra £40 billion is to decarbonise all sectors.

I make it £31.83 billion [part cost] just to decarbonise the electricity sector following the CCC's recommendations.

But because of the 25/30 years lifespans of WASPPs, the plants being built now will have to be decommissioned and new plants built to replace them.

The £31.83 billion per year, will carry on every year - FOREVER!!!

Advanced nuclear power plants would reduce that figure to £8.41 billion per year:

https://colin-megson.medium.com/by-2050-the-cccs-sixth-carbon-budget-calls-for-635-twh-year-of-despatchable-electricity-from-d1cac83a213

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