Re: 400 mile charge in 30 minutes isn't gonna to be easy - natural gas
Longbridge did - they had a combined heat and power gas turbine. Heaven knows what happened to that when SAIC took over.
Any industrial user who has a need for a lot of process heat and electricity is usually better of having a CHP solution. So these are common for paper makers, chemical processors, refineries, and manufacturing that needs either hot water or process heat (like the paint drying shops for car makers).
The Longbridge CHP will have been dismantled and shipped to China with the other manufacturing kit if it was modern enough to be sensible, if not (which is more likely, given the way that Rover/MG went down) it would have been scrapped as there's no longer any manufacture of cars and half the site has been sold for development Although there's an SAIC technical centre at Longbridge, the only production activity is some token option fitment and very minor assembly operations of Chinese made and mostly assembled cars, a level of activity akin to the final inspection garage of a normal car plant.