The garage to which the fence is attached is visible on Bing imagery as it was built before 12 to 16, so I suspect it is possible that 10 and 11 have just been estimated, without aerial imagery, to be larger than they actually are. I have uploaded some Mapillary imagery recently from Forrester Road and Harwich Road, e.g. https://www.mapillary.com/map/im/v4hlNX2jbhaOIY1vwWOv2q and https://www.mapillary.com/map/im/F9VlIUWyzBzU3AnMXEVo0R which suggests 10 and 11 should fit between the fence that is in OSM and one that isn't, so need reducing in size. I'll do that now.