JW411 - Have you tried contacting the 53 Sqn Historian? Contact details are in his book 'United in Effort - The Story of No 53 Sqn Royal Air Force' by Jock Manson. Air-Britain Publication ISBN 0-85130-260-2. I know that many relatives of 53 Sqn members have been in touch with him.
The book also records the loss of L9329 and has more information on the Squadron's activities at the time.