They've overlooked to mention the Earl of Tewksbury's gaff at the top of the Hill. Unlike Freddy H he never got around to bequeathing his land to the community in his will and it got replaced by the uninteresting '30s / '50s suburbia we see up there today. His folly's still there in someone's back garden on Liphook Crescent though. You can see it from the street. I suspect that's older than anything in Forest Hill.