I'm arriving at London Heathrow at 2:05PM, and then my next flight leaves at 3:50PM, which gives me 1h45m to switch terminals, which is fine, generally. Both are international flights. However, the second airline has written: "Last Check In Time: 2:50PM".
Does this mean that I need to arrive at the second airline's counter by 2:50PM to get my boarding pass, even though I do not have to check in any luggage? (I'll have checked it in with the previous airline and I don't have to pick it up at London, only at my final destination). My seat is already reserved. The second airline's counter will be at the terminal I'm departing from, so 45 minutes to get there is too short.