Hi, I have unlocked final quest for marleybone, but I can't enter big ben. I haven't unlocked scotland yard roof and I am very confused. I have not played wiz in ages and forgot how to unlock it...
If I remember correctly, it seems to go there but it actually is not time for Big Ben for a long time yet. It just mentions it as part of the story. So keep going with whichever part you can do next.