British charabanc outside Belgian Consulate

[carom]

This photo shows a charabanc owned by my gt.grandfather who is standing to the right.
It is parked outside the Belgian consulate, possibly in Boulogne.
Gt.grandfather was a continental carrier and wine importer who travelled a lot in France.

I'm trying to figure out who the passengers might be but haven't been able to identify any uniforms as yet. The civilians look to me like local dignitaries/politicians.
Does anyone recognise the uniforms or have any idea what the event might be?

[tonepad]

Belgian army soldiers before 1940:

http://www.rootschat.com/links/01sor/


Tony