@withthischoice Your guess is wrong.
I am going to give you the benefit of the doubt, and assume you really want to help, even if you come across as needlessly confrontational.
Even if it were as you incorrectly guessed, so what?
Let's imagine, for the sake of argument, that my wife was born in Germany, has a German passport only, and regularly takes the kids to visit their German grandparents and cousins.
Surely, from a UK perspective, the risk would be in a German adult, with maybe more ties to Germany than to the UK, in taking UK children from the UK to Germany without their UK father???
Where would the risk be in a German adult taking UK children BACK TO THE UK, where their UK father lives, and where the children are regularly registered with GPs, regularly enrolled in school, where the family is not known to social services, etc??
And yet what does the UK do? The UK, unlike most other Western countries, does NOT check passports on exit, but only on entry.
I can understand that maybe there is something we are unaware of that triggers these additional checks (similar name to a dodgy individual? who knows).
But the lectures on how this is all to protect our children and me, no, please spare me those.
Sure, checks are always necessary, and there is always the risk that a UK parent might abduct German children to take them here away from the other German parent, but the lack of exit checks is quite laughable...