I have dual US / UK citizenship / passports. I travel on my US passport to avoid US ESTA requirements. Now with the UK ETA does anyone know how this can work so I can enter the UK without an ETA. My BA profile has my US passport details. Do I need to change this to UK passport for the outbound leg. ( US-UK) and then back to US Passport for the return. Switching passports can also prevent online checkin with BA. I’d like to still be able to checkin online as generally only have hand luggage