Gort could have had a British relative
Field Marshal John Standish Surtees Prendergast Vereker, 6th Viscount Gort (usually referred to as Lord Gort). British and Anglo-Irish. 1886-1946. VC [Victoria Cross], GCB, CBE, DSO & Two Bars, MVO, MC.He commanded the British Expeditionary Force (BEF) in France, 1939-1940. He was Governor of Gibraltar, High Commissioner for Palestine, etc.
Klaatu (Michael Rennie) was British (born in Yorkshire).
Gort himself (Lock Martin) was born in Pennsylvania. And, by the way, he had a family:
http://www.findagrave.com/cgi-bin/fg.cgi?page=pv&GRid=9990&PIpi=181094