That's not dimensionally correct! Double-decker bus is a unit of length, and footy pitch is too prosaic to be an approved unit: https://www.theregister.com/bootnotes/2026/05/31/the-reg-onl...
It's not too prosaic, it's just too imprecise. There is no standard size, and some regulations even allow a range of sizes.
It's a shame it's not about area then at least we could agree on Wales as a unit.