Solar providing 27% of the UKs metered demand at the moment (and wind at 9%). Add nuclear at 9% and that leaves 26% coming from gas.
Coal today is 0%
And total demand is 37.5GW
Astute readers will spot the use of "metered". This is because not all solar/wind power is metered. Some of it just gets fed into the grid before metering which works to just reduce that total load figure.
If Andy Burham is looking for an immediate big "thing" to make the 100 day truce work, he could do a lot worse than sort out the balcony solar regs and make the UK a leader.
Personally I have no faith whatsoever, as the UK is renowned for taking decades to regulate as a trusty stranglehold on innovation and progress/