Irrespective of what you think of the system, the Common Travel area was in force, and thus he was by law here legally...Stephen Waldorf and Jean Charles de Menezes to name but two would beg to differ...Law abiding people have nothing to fear from armed police
Whilst Stephen Waldorf may not agree that law abiding people have nothing to fear,,, I think that Jean Charles de Menezes, can't possibly comment on it. It still hasn't been proved one way or the other whether he was here legitimately. (or are you going to tell me that everyone who arrives here via Ireland can legally stay here for 3 months? Irrespective of where they first came from?) If so , we may as well disband the UK border force henceforth and save the country a fortune on protecting our own borders.