LAX-LHR
Can answer your point about BHX,
yesterday the BA 744 from Delhi went straight in to BHX and was turned around,and back to LHR splash and dash in less than 2 hours.
The BA 767 from Madrid went straight onto a remote and passengers disembarked and it flew back to LHR today A PIA 777 diverted in to and again no issues ..all very smooth operation.
You are right though BHX won't turn anything away now. A complete turn around from when MAN would take loads and BHX turned stuff away few years back, puzzling.
Nigel