Honestly. The gov should force any case to be in UK courts.

Trump and his lawyers have no hope of using judges who owe him their position.

Add to that the UK is (correctly) famouse for having extream liable protections, so most would see it as advantages. It is also very much a fact that truth is a defence, so the fact that multiple US courts etc have supported the claims.

Adding. There is no way trump can stand up in a UK court and fail to commit purgery. He is just incapable. And will piss judges off no end.