https://aviation-safety.net/wikibase/wiki.php?id=28386
"At Cirencester Cemetery are located 87 graves of soldiers: 25 of the First World War and 55 from the years 1939-1945. Seven of them are the graves of Polish, which lies six airmen and one unknown soldier.
The cemetery is the grave of MPlt (Master Pilot - stage crew Officer Warrant equivalent force in the RAF after the war) Maleńczuk Julian, a former Polish Air Force pilot who joined the Royal Air Force. On August 12, 1952, the plane took off at Anson XIX (VM407) RAF Aldergrove base in Northern Ireland to fly to an RAF base at Llandow in Wales. Because of bad weather, low cloud and fog, the crew got lost and crashed into the highest mountain in Wales - Snowdon.
Three crew on board killed: one Polish (as above) and two British: F/Sgt J. Tracey and F/Sgt W. Elliott. "
My father was detailed to guard the wreck.