Thanks to both of you for that good stuff. Goofer3, I'm intrigued as to where you sourced the serial number of 'JF-J'. The Francis K Mason and Bruce Robertson books on the Lanc certainly confirm that LM736 served with 1654 HCU, but can you say how you managed to make the link? And while I'm at it, do you have any more serials/codes for 1654's Lancasters?