I have printed out the Time Out London voucher for the 2 for 1 offer. My question is can I pre-order tickets for the eye for a particular day and time using the 241? Do I just have to go to the Eye to purchase tickets with voucher & email in hand to take advantage of the offer? I would be going at the end of June, at 10:00. What kind of wait or que could we expect on a Tuesday? Thanks in advance.