A couple of notes to add
Down House was about 1 mile west of Blandford St Mary and estates of the day could well encompass many farms in the surrounding area, so a farm a couple of miles away could well be still part of the ‘Estate’
Andy Saunders has a pic of the Do 17 at Nutford Farm in his book Luftwaffe Bombers in the Battle of Britain
The link below should take you to the correct page to vie the pic
https://books.google.co.uk/books?id=TdGwBAAAQBAJ&pg=PA19&lpg=PA19&dq=%22nutford+farm%22,+Blandford+do+17&source=bl&ots=18uAnHdff2&sig=ACfU3U0X2WiLm6RqrBefLTZK7MQ069_oSQ&hl=en&sa=X&ved=2ahUKEwjmuOnw9b3hAhXIJVAKHb_wCqg4ChDoATABegQICRAB#v=onepage&q=%22nutford%20farm%22%2C%20Blandford%20do%2017&f=false