These offers are suppose to only be avaliable to Merlin passholders! On the page under the heading 'Partner Perks' near the bottom, anyone can see the promotion codes!
20% off at Buy-a-gift (day experiences etc)
Kids eat free at Hard Rock Cafe
25% off RAC cover
Free trial and FREE cinema tickets on LOVEFILM
15% off LA fitness
various offers at holidayextras.com