Lost at sea 21st Aug 1944 (age 26). HMS Kite was hit by two torpedoes from U-344 (commanded by Oberleutnant Ulrich Pietsch) and sank in the Barents Sea. Employee of the Central Argentine Railway. Son of Frederick and Gertrude Mattson, of Banbury, Oxfordshire.
http://www.cwgc.org/find-war-dead/casualty/2484220/MATTSON,%20BERTRAM%20KNIGHTLEY
2020, created by Martín Racca