Exclusive: Hanne, 16, from Sussex, was not allowed to board flight to London after weekend in Copenhagen ...
EU citizens with post-Brexit settlement status in UK will not have to present British passport to airlines ...
Travellers are being warned about hidden passport rules that could stop them boarding flights or entering countries.
A collective passport is much cheaper than getting a single adult or child's passport - see what it is, who can use it and which countries you can go to.