well I'm back in NW London and just bumped into an expat Iranian friend - he told me "everybody" (all his Iranian expat friends) thinks the Mullahs did it themselves as part of their corrupt infighting.
Highly gratifying for me to hear since the gf's been blaming me for it since it happened.
Now I'm going to annoy her by telling her this. Just thought you blokes might like to hear it first.
I'd find that a little hard to believe, forget the infighting, atomic weapons owned by Iran, must be the Holy Grail of keeping their vile regime afloat.