** caution Assumptions **
Ten rooms + ten overnight allowances = say £1,500
Average oneway fare, excluding taxes = say £40 = 37 seats just for overnight costs.
Thats the reason companies like FR, U2 and EI hardly have any overnighting staff anymore.
To absorb this much costs bmibaby must have a devious plan. Would make far more sense to base this crew in BHD, and over night two crews on day a week in CWL.