It is standard now a days.
With British Airways you can fly domestically from anywhere in the U.K. or Ireland (CTA) without ID. This is not checked at the gate for boarding so technically you could buy a ticket and somebody else travel in name so long as you had no bags, or the person comes to the airport with you if they have bags, they check in travel and nobody would ever know.
Scary thought in today's world but then so are a lot of things in the aviation industry.