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Yep, that's covered in the full report (here if anyone wants to read it: https://www.theccc.org.uk/publication/sixth-carbon-budget/).
Just above the chart it says this:
Modelling commissioned for this report suggests that the level of UK GDP would be around 2% higher than it would have been by 2035 as resources are redirected from fossil fuel imports to UK investment.
And there's a more detailed projection deeper in the 'Macroeconomic impacts' section:
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OK, because on top of that I believe is an additional 3% (net 2.5%) bump to GDP by 2050, that chart doesn't include the macro economic impacts