I'd be interested in seeing the Particulars of Claim.
What this has made me think about is whether LHR is a 'Just In Time' airport. I suppose for quite some time now I've avoided the place for the very reasons given above, it cannot handle anything that falls outside of 95% of normal operating conditions. Just not the sort of place to depend on, and the airlines who fly out of LHR tend to be below average performers too in their own right, which just compounds the problems.
Regional airports and trains are the way to go. Would never have said that ten years ago, how times change.