Return to the UK after Extradition

We were instructed by a Polish national who was refused admission to the UK in the course of his attempt to return to the UK. He has lived in England for many years and was convicted abroad of an assault occasioning actual bodily harm and sentenced to one year and two months imprisonment.  A European Arrest Warrant was issued by a Judge in Poland, and he was arrested and returned to Poland.  He tried to return and was stopped at the UK border and refused admission, detained and returned to Poland.  We appealed against the decision to refuse his entry, and the appeal was successful.  The immigration decision failed to demonstrate that the Secretary of State could not have refused his entry as there were no grounds of public policy or public security and did not comply with the principles of proportionality.  His previous offence was not a sufficiently serious threat to affect one of the fundamental interests of society.