Have you tried contacting 'Buzz' Took or Richie Pymar at the Halesworth and Holt Museum in Norfolk yet?
They are very informative and have lots of info on the 56th FG. They helped me out with a project I worked on in 2007.
http://www.blythweb.co.uk/hafwarmemorials/index.php
http://www.halesworthairfieldmuseum.org.uk/
Contact Information:
Halesworth Airfield Memorial Museum
Sparrowhawk Way
Upper Holton
Halesworth IP19 8NH
Telephone: 01986 875084
Email the Museum: mail@halesworthairfieldmuseum.org.uk