To me, the most worrying about the report is the fact that the explosion overpressures found at Buncefield were much higher than one would predict for such an unconfined Vapor Cloud Explosion. This may have considerable impact on similar storage sites where there are other buildings nearby.
I agree: This may have major implications around the UK.. The COMAH report levels for consequences maybe significantly revised...subject to an understanding of the mechanism..
Based on my readings of the incident description, the response and the "post mortem" evaluation of the fire, there should be an engineering review of tank overflow designs for flammable liquids.