Well, I thought it had all gone too smoothly. Just been e-mailed to say I need to return my tickets!
Because the website wouldn't apply my ACO discount back in October I paid full price while booking and then ACO reimbursed me after. Now it turns out I have to have different member specific tickets and my original ones have been cancelled.
How ridiculous just to keep the red tape flowing, what does it matter what the ticket says!!