hpc,
as mentioned earlier this thread is about bmi REGIONAL ....who fly EMB 135/145's.
bmi MAINLINE fly the airbus and are based at LHR so you would naturally get LHR as your base.
Try the link below to the thread BMI mainline t & c's currently running in TofE
http://www.pprune.org/forums/showthread.php?t=280854