I don't have the answer, however here is a question for you.
Yesterday, was the anniversary of the Trophy Final at the new Wembley.
Today is the anniversary of the LDV Final against Blackpool played at Cardiff.
We also played at the old Wembley when the club beat Chesterfield.
How many other sides apart from the mighty U's have played in competition finals at the old Wembley, the new Wembley and Cardiff and have not played in the Premier League?