So when I buy a standard annual pass can I go straight there, pick it up and straight away I'm allowed to pay money with the pass to go straight in or do I have to go home buy a ticket with the promo code online and then go 

EDIT: For fright night

Pretty sure you can do it there and then as long as they are not sold out on that day. Best thing to do in this case to double check is tweet them at @thorpepark or email at customer.services@thorpe-park.co.uk