Grumpy, the 10 year suggestion would seem reasonable.
I am away for a couple of days but have some 1960s - 1980s MOD documentation at home that may provide some clarity. I will post next week.
Tim
__________________
"Manui dat cognitio vires - Knowledge gives strength to the arm"
"Better to know it but not need it than to need it and not know it!"
"Have more than thou showest, speak less than thou knowest."
|