Originally Posted by
BKS Air Transport
Yes, those are my thoughts as well.
I've had a look at what BA say (I don't believe they themselves require any ID for domestic flights), and they
advise carrying photographic ID, as 'this may be requested at certain points in your journey'.
I guess I found one of those points
If you went through
Border control then was not down to BA doing a ID check, TBH it sounds as if you were being treated as an international arrival or somebody who (excuse the term) had been “contaminated” by contact with international passengers who themselves were in transit between the two terminals and had not entered the U.K.