Nature of the failure and it's effects, closest Airfield, longest runway, best weather, best rescue and firefighting services available, crew familiarity, terrain, company port......
All the things that go into the mix in the Captains head.
I'm sure he did what he needed to do and the professional ATC in London did their usual brilliant job.
Well done.
Last edited by nitpicker330; 18th Jul 2014 at 11:32.