I was aware of this poem as a boy in the 1960s and have just stumbled on it again while checking out Adlestrop (I now live in Oxfordshire and it's late June!) . The names were all country houses in the woods south of Brentwood, Essex (viz. Childerditch Common) , which I discovered on a pre-war OS map I was using to explore by bike. Even by then, many had disappeared. Does anyone know the link between Edward Thomas and this area?