Many thanks for the reply especially the detail. You are correct we are transferring to a non-domestic flight. It looks like flight connections have nto moved since the last time we transferred through T1 - probably the best part of 5 years' ago.

Its a shame the BMI flights aren't being subsumed into T5 to save all the hassle. But I undertand the capacity restraints and this flight was a GOOD bit cheaper than other options .