There is, but it goes the other way to the IFF. And the gas pipes are a one way system, so the IFF won't fire the seat, if you see what I mean.
Do remember that this seat has been flown for (easily) hundreds of thousands of hours and saved MANY lives - I think I have over 2000 hrs in it. This is a very unusual incident and I think we'll have to wait for a finding.
I would say that this, and other associated threads, have brought forth a HUGE amount of knowledge about the Mk10B, so thank you all. But, we haven't come up with any answers. Let the investigations do their work now.