Upvote:1
If youβve booked this as a connecting journey (one Passenger Name Record) you should be able to check your baggage through to Vancouver and your flight itinerary should not typically involve transferring baggage, check-in or passport control. Transferring between terminals is explained on the Heathrow website https://www.heathrow.com/connecting-flights
This UK government website will tell you if you need a transit visa, and if so, how to apply. As a Canadian visa holder travelling to Canada itβs likely that you donβt need one Is there a way to find out if I need a transit visa for a layover in the UK?