I think you have put a very cogent and compelling argument there, particularly the point about clearing the schedule down to make it viable, that's 90% of what a skeleton for MCOL could look like. I say MCOL since BA will simply state it was all down to bad weather, and I am fairly sure CEDR would agree with BA on this. So by all means submit that and see if BA pay up - I may be wrong in not being confident - but at the back of your mind you will have to consider if you are prepared to take it further. Using Bott may be another option too, but I'm not sure how much extra they can add given what you have already detailed.