Whilst I always regard Falcon catalogues as a guide, the 1960 one, which may well have been prepared in the autumn of 1959, only offered the following models:
non 531:
Black Diamond (5sp or 10 sp)
Super Tourist (Sturmey Archer)
531 plain:
Club Special (5 sp or 10 sp)
Olympic (10 sp)
San Remo model 80 (5sp or 10 sp)
531 butted:
Super Route (10sp)
Super Route Special (10 sp)
I suggest you check the seat pin for size to see what sort of tubing it might be - but not always a perfect clue!
I also have a Super Route (it says so along the side of the top tube at the front) from about the same time with a similar seat lug and the round wrap-over tube detail also in the flamboyant copper colour. I have also seen another one, of similar date, with the immichrome sticker - so yours is not alone.
Mine has the Cycle Benelux unique rear derailleur fixing on the rear dropout, which, according to the catalogue, is the standard spec. It also has a blue seat tube panel, with the flaming torch and designed by Ernie Clements emblem on it with three additional narrow blue rings above and below the panel. I have seen a black seat panel on another one but that had one black ring above and beneath the panel!
I don't know if this takes you any closer to an answer as to what model it is. Look closely at the paint finish all over to see if a name has worn off.
I too have a 1983/4 pro. Perhaps we can compare notes on those in the future?
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