[[Winston Churchill|Churchill]] besøgte de Forest i sit hjem i [[Lancashire]], [[Rosefield Hall]], nær Southport.<ref name="southport">{{cite news|url=http://www.southportvisiter.co.uk/southport-news/southport-southport-news/2010/03/26/the-story-of-baron-de-forest-who-often-entertained-his-friend-sir-winston-churchill-at-his-home-in-rosefield-hall-101022-26111239/|title=The story of Baron de Forest who often entertained his friend Sir Winston Churchill at his home in Rosefield Hall (built in 1908 and originally named Hermons Hill)|author=Tom Duffy|date=26. marts 2010|newspaper=Southport Visiter|accessdate=11. december 2010}}</ref> Churchill tilbragte også meget tid på De Forest's [[yacht]] og opholdt sig tre gange (i 1908 sammen med sin kone under deres bryllupsrejse rejse) på de Forest's Schloss Eichhorn (Veveří Castle) i Moravia.<ref name="churchill">{{cite news|url=https://books.google.com/books?id=HBUslUOGOgkC&lpg=PA154&ots=emhCUyCO46&dq=de%20forest%20west%20ham%20election&pg=PA154#v=onepage&q=de%20forest%20west%20ham%20election&f=false|title=Winston Churchill: a biographical companion|last=Wrigley|first=Chris|publisher=ABC-CLIO|year=2002|page=154|isbn=978-0-87436-990-8}}</ref>
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