BA T5 visa conundrum
Had a boarding pass rejected last week just before security at T5 with the message to go and see a member of staff. Apparently I needed a Visa to return to my travel origin which was Germany even though i have approved permanent residency there, I'm a British passport holder BTW.
BA staff couldn't really explain to me why just that something had changed recently and an additional check was being made. They then changed a setting I believe and boarding was as expected. I didn't see any request to provide additional information other than passport info when booking the flight or when checking in via my BA APP.
To my knowledge I don't think I need a visa but someone somewhere obviously thinks otherwise.
Would be most grateful for any feedback or info
Thanks in advance