I've seen that photo before, and as far as I remember, it was taken at one of the Le Bourget airshows in the mid-sixties, in front of the wooden full-scale mockup...
I realise it would be part of the entire Concorde design and build process, but I dread to think how much a full scale wooden mock up such as that would cost to build nowadays. Around the equivalent of a couple of top UK banking executive's annual salary and bonuses in 2012 maybe!
Looks like there are passenger steps on the port side... would there have been an inside sample layout as well? And I'd love to see a colour pic of all those different uniforms.