BD have a small based amount of cabin crew at BHX, this has been the way since the start of the contract last year to run the 3 times a day service from BHX - FRA.
However as some of the BD cabin crew have moved onto pastures green, BD have to
bring in staff from LHR and MAN to man the flights, and yes they have to stay in hotels and taxi back and forth from there respective bases.
Hope this helps.