left bmi about 2 yrs ago, having been a LHR and later EDI based Flight Supervisor.
BMI have got a good atmosphere, that is cabin crew and flight deck.
Pay is not the best in the industry, espacially after stopping the good night stops, CGN, MUC, BCN.
As a junior you'll take home around £800. ex flight pay.
LHR has the best opportunities for promotion and the best routes.
Interview's probably the most relaxed in the industry.
Would strongly advise you to do it.