I know, I need to pass through UK border control if my transit time is before mid-night next day of my arrival and do not need visa as I have a valid permit to stay and live in Canada (source: https://www.gov.uk/check-uk-visa). On my return to Canada through Heathrow, I have a connecting flight from Terminal 2, next day after 18 hours of my arrival at Terminal 4. My confusion is where shall I pass through the border control, at the arrival terminal (T4) or departure terminal (T2). Can I just walk toward border control, or I needed to be told about that?
Please help to reply.
This question is not about weather or not I need transit visa, I want to know at which terminal, arrival or departure, do I need to do my immigration stuff. I am sure, I wont get my borading pass from Heathrow to Canada at my point of origin (issuing boarding pass 24 hours before the flight is not possible).