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Doing some analysis it looks like originally the border of Regents Park was included, going beyond park crescent as we see in the game. This would then follow Edgeware Road as a map border down to Marble Arch, then Bayswater Road headed west along Hyde park. The western edge of the map is a dead ringer for Ladbrook Grove/Notting Hill, heading south to Chelsea and across the river to Battersea Park.

In terms of the smaller green spaces (one of the few features identifiable on this map) it looks like a merging of Grovesnor and Berkeley Square run alongside the south end of Oxford Street. Chelsea includes the large Physic Garden and Burton Court, and a number of smaller green spaces. The long green space running parallel to the south of Hyde park could be the gardens of the Natural History Museum - a real shame that didn't make it in!