[Nick Beale]

I'm not sure exactly what you're looking for in the Luftwaffe material - is it material with a bearing on naval operations? Naval Enigma hadn't been broken in 1940, had it?

1944-45 has been my main concern and the naval material in HW5 is very limited over that period. HW5 material about U-boats or coastal convoys often seems concerned with air attacks they have suffered or tactics to avoid such attacks, so I guess it is included for the RAF's benefit. I have also noticed that such items often carry both a "main series" serial number and a naval series one (suggesting to me that the original would be in the naval files).

There is a file devoted to Sea Lion: HW 48/1 "Intelligence reports and correspondence concerning German preparations for the invasion of Britain." I haven't looked at it myself though. Bletchley Park referred to Seelöwe as "Operation Smith" incidentally.