Youre right.
You do know where Dover is? Who checks passports there ?
Afaik there is also a Dovor in the US
It got mentioned in a Soprano episode
As to who checks passports at Dovor (UK)
I assume it would be the French ??
As you seem to think that the UK is responsible for Calais
I have assumed that you are if the opinion that the french are in charge
Of Dovor ???