A guy at work mentioned that Cineworld are planning on showing all Harry Potter films from the 8th of July (one each day) on the run up to the final installment.
Could be a no-brainer for those with unlimited cards.
I've been planning on doing the unlimited thing for ages and now, apparently, they have a special self-serve point in the entrance for just that purpose (ideal for those who can't get to grips with re-sizing pictures for the online application)