Sorry, chaps, disagree here.
The FAA are wrong on this occasion. The BA crew did the right thing, all things considered - I totally agree with the decision to continue, including 'due regard' to the FAR's pertinent to this situation. I myself have been in this position on the '400 (sort of). It seems the FAA have become more familiar with ETOPS over time and forgotten about 4-eng ops....
Multiple en-route divs, legal fuel to continue, abnormality contained....what's the point in spending $150M if you don't use it the way it can be operated to full advantage?
Contraversial opinion, I know....incoming....