I think the thing is, there aren't all that many people that dress Edwardian every day or are interested in all the elements of Edwardian style, and therefore there won't be a forum dedicated. I suspect he'd be better off in the library. Is it only the period of British history he's interested, or the equivalent time in America? Because if it's the former, the BBC has just shown a 6 part series called 'Casualty 1909', which, although it's set in a hospital, it is recreated from real records and shows a fair bit about London at that time. And it was really good! There was also Casualty 1906 (one episode pilot) and 1907, which was 3 parts a couple of years ago.