1 Briefly, here is what I went through: after being denied boarding on Sunday afternoon, I was advised to go to AirCanada service desk to arrange a flight back to Canada. AirCan desk was closed and would only open Monday am. Also, I do not have a UK visa nor visa-free passport

5 Issue is, the only flight I could take was scheduled to Wed. So, the immigration officer told me that if they would give me the 24hr visa they would essentially detain me the next day as I would not have left the UK in that timeframe