So LTN Man I guess you know the date
I first saw 'XML on 9/5/70 ( 'fraid I was a spotter then)- Given how often I got to Luton it would have been under two weeks old at that point.
So most likely May 1970 then - possibly June.
There will be very little of my childhood Luton left soon- the hangar another nail in the coffin.
At least the main apron stand numbers to some extent remain.