Nigel, Parliament was prorogued (or not) for five whole weeks. When conferences are going on, parliament is recessed by general consensus, and may be recalled. It was open to Johnson to announce the usual few days' prorogation before the intended date of his Queen's Speech. He chose to do what the Supreme Court has soundly bollocked him for instead. Perhaps you should acquaint yourself with the difference between a recessed parliament and a prorogued parliament. They are a very long way from being the same thing in constitutional terms.