In two weeks i'm flying to YYZ from BCN with a stopover at LHR.
The first leg is BCN-LHR with BA and then LHR-YYZ with AC. I was wondering if my baggage would be checked all the way through or I have to take it in LHR and check it to YYZ.
I also have to transfer from T1 to T3 in LHR, any comments on how it is??