Walter (#8927),
...where I had stored the escape compass...
ISTR that another idea was to have a trouser (braces) button, metal exactly like all the rest on your uniform slacks, but magnetised and with a tiny luminous spot (on the back ?) to show N.
Perhaps the Germans had rumbled this trick by the time you fell into their hands, and so the RAF had a compass issue. Can think of other places to hide it - but we won't go into that !
Can't remember what I had to go on ops with.
Danny.