I've had an e-mail from Simon Glancey <info@wwrgallery.co.uk> who wrote:
Hello there. I was recently at a dig of a IV Sqn Mustang I AG617 which crashed in Northumberland on 19th February 1943. I wish to produce a profile illustration of this plane, and wondered if it was possible to find out what code letter(s) it carried in Feb 43. Is this something you may be able to help with, or could you point me in to soemone else who may be able to help? Many thanks, Simon Glancey
Website: http://www.wwrgallery.co.uk
If anyone has information on this could they reply to Simon and also post it here?