The right hon. Lady is absolutely right that these will be very complex negotiations. It was right to wait the nine months we did before invoking article 50, so we have been able to do a considerable amount of preparation. As we move forward, some very technical discussions will of course need to take place, as well as the higher level discussions that will need to take place. I assure the right hon. Lady that we consistently ask ourselves difficult questions to ensure that we are testing every approach that we put forward, so that we can get the best possible deal.