To add to my previous post I just checked the BOGOF cert and it says "cannot be combined with any other offer, promotion or certificate". So, that clearly rules out the use with any other certificate (such as the 25% off one) but what is classified as a promotion or offer? Is a AAA rate a promotion? Is it an offer? Is an advance purchase rate not also a promotion or offer? Pretty much anything other than a rack rate is on offer...