Thanks for the feedback guys!
DragonRapide – I’ve been a member of the Blenheim Society since Jan 2005 but can’t recall the sirens having been a topic in any of the journals I have. If there is something is should be in the pre 2005 issues so if you could check that would be great.
BSG-75 – It’s definitely the Mk IV Blenheim I am talking about, 13 Sqdn converted to the Mk V late in 1942 and then moved to North Africa. They may have used the sirens on the Mk V of course but I would doubt it.
I’m attaching stills from British Pathé footage, one shows the undernose siren in action (can’t attach the sound!) and for the curious amongst you, the two tubes extending from the bomb bay are part of the gas/smoke screen spraying equipment and I’ve also added a still of those in action.
Keep the suggestions coming please!
Cheers,
Walter