My niece is a UK Citizen and is flying from Newcastle to Vancouver, connecting in Heathrow. I heard she may have to go through Customs & Immigration in Heathrow before she boards the flight to Canada. This does not sound right to me - I would think she would not encounterCustoms/Immigration until she hits Canadian soil. I need to know so that we can allow her enough time in Heathrow to connect.
Anyone know a definitive answer on this?