So I did not get this one before completing the story and after the story, the ghost just claps.
So MAKE SURE YOU TURN THIS EXTRA ON ASAP.
I have now got it but I had to create a second game and play through as quick as possible to get this.
I had to do 3 lessons and 2 levels and then i was being taken through to the quidditich level through the courtard with the fountain. So i could then get the red brick, go and buy for 99,000 (i was making an effort to grab studs before this) and then return to hogwarts. You can then do a very boring "stand under nick as he guides you across the courtyard and gives out studs", when he gets to the quidditch training part, run back across the screen, back another screen and pick up Nick again and follow him again. After around 10-15 runs of this it pops. Boring but least then its done.