The last government intentionally banned the cheapest source of energy, onshore wind, from being built in England, by making it so that a single complaint could stop a project. I cannot believe this article talks about planning constraints and energy prices and doesn't mention that.
wouldn't have mattered due to the screwed up energy pricing system, if there's a single watt of electricity in the grid produced by burning gas, we pay for the entire grid output as if it was gas
Different energy sources contribute unequally to that second important factor - the stability of the grid - and that has to be factored in somehow. Nuclear, gas, hydro-electric storage and buying from abroad provide that stability in the UK.
How it's done - I've no idea - but it's not just a question of units of electricity.
One way is to bring in more surge pricing however people like the predictability of stable prices.