Thanks! I did read this before posting though. I was on BA845 scheduled at 10.55 from DUB to LHR, and it was delayed for over three hours. BA are in full denial mode and blaming weather, but we were told by cabin crew that we missed our scheduled take off slot due to a ground handling issue, and additionally when I checked the previous and next flights on the same route were only delayed by an hour or so. They refused to give me a deadlock letter, or evidence their belligerent reply, so I've waited out my 8 weeks patiently, and then discovered this thread when putting together an ADR submission.