Originally Posted by
frontenac551
The LHR-YYZ is with BMI. Since it is booked as one ticket, BMI will check through my baggage, right?
Yes!
Originally Posted by
frontenac551
Will they also print my LHR-YYZ boarding pass?
They should do if it's one ticket and your LHR-YYZ flight is open for check-in.
In worse case you just have to visit a transfer counter at LHR which shouldn't take long.
The baggage rule is only applicable if you have separate tickets, i.e. one ticket MAN-LHR and one ticket LHR-YYZ when BMI will force you to reclaim and recheck your luggage at LHR.