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It’s still capped at £1/kWh, which is a lot but also a price I’ve seen maybe for a few slots on a couple days in the last three years.

The price was known ~1 day in advance so I had the choice to fill up the battery with cheaper (but still high) prices overnight and reduce the impact

Consumer pricing in the UK is regulated with a price cap (per kWh), so consumers can't be fleeced in an unexpected event.

Business energy users aren't protected, so they buy long-term contracts, hedge, or go-under in the event of an unforeseen energy-shortage.

That's what batteries are for.

That is the trade off for renewables. Power is very expensive when needed and very cheap when not.

Electric power is very expensive when demand is greater than supply, very cheap when supply is greater than demand.

One property of electric power grids is that supply exactly equals demand.