there's a similar swindle in Zone 1 boroughs e.g. Pimlico for "communal areas" - strips of ~20x100m gardens behind 2m high iron railings dotted amongst the eyewateringly overpriced townhouse squares. the waiting lists are around 15 years, by which time your housebound puppy is dead and your asthmatic newborn is still wondering what a flower looks like IRL. you either have to wait for the greedy elderly bastards to die sooner or move out of London altogether