I am trying to find the location of the house used by the Polish Radio Intelligence Company in Felden. It was called 'The Arches'. There is a clue to the location: “The London to Bletchley railway line… passing the town of Hemel Hempstead, on the outskirts of which sits the village of Boxmoor. Unlike Hemel, Boxmoor has a station on the line and it is less than a mile – if a stiff uphill walk – from the station to a large house in comparatively rural surroundings, in a place too small to have a name, but nonetheless called Felden. Its isolation, hilltop setting and railway link made Felden the perfect place for foreign spies to keep an eye on an ally of dubious intentions. The house was called ‘The Arches’ and it was requisitioned by the British in May 1943….On 22 June 1943, the Polish Radio Intelligence Company commanded by Captain Kazimierz Zieliński moved into the house, in whose grounds there were now 8m radio masts and associated outbuildings…” (From ‘X, Y & Z: The Real Story of How Enigma Was Broken”, by Dermot Turing). A possible place would be where it shows a water tower (just under word Felden) which is on the high ground at Felden shown in the 1956 OS map attached. There is a partial picture of the house; link - Polish Embassy UK on Twitter After 1945 became a pow camp (No.235). Thank You.