Tickets get sent via email therefore you're more than welcome to print the tickets out and give them to the person you bought them for or forward the email containing the tickets to them as they only need the barcodes to scan upon arrival.
The second option is if the card holder is not attending on the day, they will need to provide a signed letter of authorization to the named person collecting the tickets, including the following details:
"I *name of card holder* authorize *name of person collecting tickets* to collect the tickets from order number *booking reference* paid for by my card *last for digits of credit card used*.
The named person collecting the tickets will also need to bring valid photo ID along with the signed letter. Please be aware if you are collecting a Merlin Annual Pass the card used for payment will always be required and the pass/as will not be issued without it.