"Salt Water Switches" .. what on earth are they and where would they have been fitted on a 206?
I must say, I think I would rather execute a manual float inflation prior to splash down lest one be subjected to that sinking feeling!
Oldlae, by the time you joined Twyford's was AXXD still about and did they make her airworthy again because one sees that she remained on the register until 1981?