Benjamin Sesko roars in delight after scoring Manchester United’s second Credit : Jason Cairnduff/Action Images Job done. Pay no attention to the caution or the mantra about the focus being on Liverpool and nothing else: Manchester United will play in the Champions League next season. This was a tough evening and it was also a reminder of how far this club must climb if they want to be competitive on the biggest stage, but this victory over Brentford was enormous and how you could tell with the roar at the final whistle. Were they fortunate? Yes. Did it matter? No. What counts is what happens next and that centres on Michael Carrick, the man who has masterminded this fightback. His role remains “interim manager”, but with each day and each win, the argument strengthens that the first word of that title should now be removed. Carrick never flinched when the game ended, simply turning to Keith Andrews to shake hands, and it would not be his style to get carried away.…