Actually if you have a moment for a follow-up question - I've never flown BA so I wanted to check whether that is a standard BA protocol? If I arrive in any airport on an airline other than BA - but plan to connect to and depart on BA - does BA require that you check-in at a desk (not simply check-in on the app and just show up at the gate) and if so can you do that airside? I just have carry-on but if BA requires a desk check-in I need to factor that in. Not a big deal if the desk is airside but quite a big deal if it isn't.

thanks