Instructions:Just found this on the Sprite bottle (2L)
2 for one tickets vouchers - there's two on the back
this voucher entitles 1 free entry when accompanied by a person paying the adult full day rate
its valid till 31/03/08 with the exception of two days 26/10/07-28/10/07 not included or when the parks are closed.
Guests under 1m enter parks free of charge.
cant seem to find any info on the alton towers website about this voucher nor on the sprite site - could take a pic i guess.