What they fail to mention is that the advice remained active until it was withdrawn on March 13th, so it remained "live" whilst the shit was hitting the fan.
Mr Cope may like to reconsider being a smart arse and Johnson might like to admit that he simply hadnt a clue what he was wittering about in his PMQs reply. He needs to take a learning point from this: if the LOTO asks a question with a specific reference and a specific date, the chances are that it a) exists and therefore b) needs a factual answer....he was a lawyer so he knows how to ask questions which are very tightly framed.