RE: Middle England's allotments become metric battlefield
Assuming you are referring to one or two specific former colonies (US and Canada), you are incorrect both semantically and in your assumption.
Semantically: in the relevant colonies they are called; baseball field and ice hockey rink. Here pitch is what the pitcher (akin, but not identical, to the bowler in cricket) does.
Problem with the assumption: While ice hock fans and basketball fans generally have some idea of the size of their relevant play environment, baseball fans do not. As a highly irregular shape, with widely varying dimensions, most would never think to try to use a baseball field as a relative measure.
Far more common than any of those, though, is the football field. It is a different size than a football pitch (similar, but not quite the same), and, usually, rather than being used as an area measure, it is usually used as a length measure. Very common for ships.