British Airways has a dedicated lounge in Terminal 3 of Toronto Pearson International airport YYZ.
Looking out at the airfield, have your pre-flight dinner or chill on one of the many plush chairs. In many ways, it is similar to that of the BA Galleries Lounge at Heathrow T5.
As part of the ‘Sleeper Service’ from Toronto to London on British Airways, the routine is different in that dinner is served buffet style in the lounge and a small meal with a dessert just soon after take-off so that you can get to sleep right away and wake up just before your arrival.