“for those in the business of letting properties and dividing properties and subletting rooms in properties, contrary to the planning restrictions…to view the enforcement notices as a business expense. The limited fines that are passed in the Magistrates Court are merely a business expense as far as they are concerned, and it is worth their while delaying and delaying and delaying, because in the meantime they are gaining much larger income from the rent they are receiving from the various tenants in their properties.”