My sister and I are travelling from Amsterdam to Reykjavik, iceland with a "self-transfer" in Manchester for 3 hour. We are only bring our hand-luggage, so no need to claimed any luggage in the Manchester airport. Do I still need a transit visa for UK? And for the return, we are going to have "self-transfer" again in Gatwick Airport, with the same condition, do we need a transit visa for UK?
I read in the website https://www.gov.uk/ , I don't need transit visa if I don't pass through UK border control, but I have no idea if I need to pass through the border control to get to my next flight.
Please help if anyone have similar issue. Thank you!