I have been working my way through the threads in the old forum (only another 250 pages to go!!) and I noticed a thread from MattMZ589 in 2005 requesting information about the serial number for a 199 Squadron Halifax aircraft code EX-A at the end of the War. The thread did not appear to have any replies.

Matt, if you are still visiting the forum, the 199 ORB indicates Halifax III PN378 EX-A operated as part of a Mandrel cover for operations to Kiel on 2-3 May 1945.

Belated best wishes