Heather, T2B, forgive me for jumping in on this thread, but I can't seem to find a way of PMing on this forum. . T2B, you mention your Blenheim book and I get the sense that you may be able to discern the code letters for a given aircraft. My interest is in MkIVf, T2112 serving with 203 Sqn when lost on 20 Oct 40. My research so far shows that it would have worn the allocated sqn code NT, but as for the individual letter...? T2B, can you help?