G-ATEL?!
AviationTraders Engineering Ltd.
So personal reggies were alive and well, even in 1957!
That sequence wasnt issued until 1965.
I always thought the first UK out of sequence registration was G-BSST for the first UK Concorde, and only then because the French had done it.
I was wrong. Did Freddie Laker have someone inside the ARB/Board of trade?