Squadron leader Allison was serving with 16 OTU, and was a crew member of Wellington III X3923 which took off from Upper Heyford on a night training exercise and was involved in a mid-air collision over Oxfordshire.
Royal Air Force Bomber Command Losses Vol. 7: Operational training Units 1940-1947. W.R. Chorley. 2002. Midland Publishing. ISBN 1 85780 132 6. P264.