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Hey mate, sorry that it took me a while to reply!
The lugs look to be the same as mine, as does the bottom bracket. But my dropouts are ultech (assume other mid-end 80s concordes used these, but these definitely vary) and my brake bridge looks like this (which I've seen on many other concordes, but couldn't say if they all looked like this!): http://farm5.static.flickr.com/4033/4614979533_db03b9e9bb_m.jpg
I've seen yours before, but can't recall where. Maybe a non-butterfly gazelle bridge? Curious and curiouser...
@Engineering101 here's some pics: https://www.dropbox.com/sh/k5yf1ojfjxdmu6q/AAAW-qn3RQ90WNWPmdCaUkR4a?dl=0
thanks in advance!
Wim