There is no such thing as a cheap renewable when you need to have coal plant running 24/7 as a backup.
Conversely, the sun does shine even if you don't put up a solar panel.
QED your claim is falsified.
I don't care enough to figure out where exactly your mistake is, but the facts prove you wrong: the coal does, as a point of fact, get switched off.
That power station, Ratcliffe-on-Soar, actually does get switched off.
It really, genuinely, does not get kept on 24/7 the way you keep saying it does.
Whenever it does get switched back on, this is considered newsworthy and announced in the media as it "getting warmed up".
If you want to change my mind, don't tell me to re-read your own previous words on this topic, come up with an actual link to a document that says how much coal it uses each day.
Such a source would have to also explain why the following record shows both Annual Output (MWh) and CO2 Emissions (Tonnes) both fell by a factor of about x8 between 2018 and 2020: https://osuked.github.io/Power-Station-Dictionary/objects/10...
That is, basically the only way for the coal not to run anyway is if you switch it off permanently and replace it with non-coal-based fossil fuel plants at great expense, which also requires a bunch of ongoing development of non-coal fossil fuel reserves and production to feed it, something green groups are opposed to. Whilst there's enough already-known fossil fuel reserves to blow past CO2 emissions targets and environmental groups always use this to argue against further exploration and development, those known reserves contain far too much coal and too little natural gas.
A quick Google for news about the (singular remaining coal plant in the UK) Ratcliffe-on-Soar Power Station, suggests that the thing has at least one intermediate state when there is a forecast of excess demand soon-ish.