By airline/train or UKBF staff? There’s a difference as airport staff won’t check visa validity etc or do the entry checks that are the subject of this chain.
UKBF checks passports on departure at the Eurostar. At manchester airport at least, there are no routine outbound passport checks by UKBF
No, that's actually French border control. On the Eurostar, you clear the destination border when you check in, so that when you arrive you simply walk out.
UKBF checks passports on departure at the Eurostar. At manchester airport at least, there are no routine outbound passport checks by UKBF