I think whoever operates LHR, BAA or not, would have or will continue to experience the same problems. All caused by squeezing too many flights into an airport that was full to capacity many years ago, so not surprising that with the slightest hitch, whether it be enhanced security, baggage breakdown, strong winds, fog etc etc there is just no flexibilty available to manage each situation with effective contingency plans without major disruption. Airlines see LHR as a big money maker and I'm sure put much pressure on BAA to get access, so it seems like first priority is to obtain runway slots and fingers crossed that the rest of the operation works, so in my view it's BAA, airlines, schedulers and Government all to blame for the mess.