Bicycle Tag of bike

Hopefully KT Bee can provide an appropriate clue; she knows a ridiculous amount of stuff about this building!

Yes, sorry about that, accidentally slipped into full-on history bore mode. Great tagging with you, though.

Ah, but it could be on the un-googleable street one street over.

Not sure about ungoogleable - in a naughty way, or a every-second-street-in-london-is-called-this way?

Is there a French connection?

Mais oui. But they're just one of the different groups who have passed through the **double **doors over the years.