Can I use a *A lounge with the BMI ticket AFTER we land?
No
Will BMI check our bags all the way to EWR, so we don't need to go outside, get them, then go back through security? We'd like to go into London for lunch time permitting and this would help greatly as I have a 4.5 hour lay over...
BD will only check luggage through if it's one ticket. If you booked the bmi flight seperately, then they will not check the bags through for you.