No Hard Feelings, Then

Dear Migrant (first name, last name), kindly note:
We'd like you on the earliest plane or boat
As can be managed without undue strain
To British infrastructure. We'll detain
Your half-breed brats in some discreet resort
And then, with due regret, we shall deport
Should you continue, with your British spouse,
To take up British space in British house.
Unworthy though you are of native boon,
We hope to see you as a tourist soon;
Till then, be grateful we have left you free
To make your own way home. Love, HMG.
PS. Hang on, for even in Whitehall
Honest mistakes can happen to us all.
Unfortunate, that error; just relax
For now, and don't forget to pay your tax.

H O Dreardumb