I may be wrong.
You often are....as we are about to see again.
Ihasn’t the UK Government banned production.
Yes, but in 2006.Nothing to do with Brexit.
more recently, since Brexit, importation of Foie Gras in the UK?
Wrong. It is still available to buy in the UK.
II suspect neither production or importation of it into other EU countries is banned in the EU.
Wrong. It is banned from production in many EU countries, Germany included.