I fly for work a lot and I have to say, the border thing is a complete fuck up. We allow all sorts of passports through our E gates at Heathrow. But I am standing in a long queue at the moment - it's more than an hour trying to leave a European country. There are 3 flights to London from here in the next few hours - there aren't enough border control staff to check all the passports plus all the Americans, Chinese, Japanese etc. so every 20 mins they screech the next flight that's going and drag people out the queue.
I have this every single time I fly.
Brexit is an absolute disaster for travel!