Allotments and similar systems are often meant to provide space for people to grow food or just do hobbyist gardening. If you were allowed to build and live on

Allotments and similar systems are often meant to provide space for people to grow food or just do hobbyist gardening. If you were allowed to build and live on them legally the people meant to use them would be competing with home land prices. It's basically zoning or declaring a park.