From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jamie Cockburn <jcockburn@bloxx.com>
Subject: RE: Iptables: Matching packets leaving a bridged interface
Date: Thu, 26 Jun 2014 08:27:39 +0000
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To: Pascal Hambourg <pascal@plouf.fr.eu.org>
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Thanks for all your help, I think with your advice I can progress with this problem now.  

I've added the information you provided to the stackoverflow question in case anybody else meets with a similar problem in future:
http://stackoverflow.com/questions/24397358/iptables-matching-packets-leaving-a-bridged-interface