... mine almost always expire! Availablity is an issue and I think all but two in my entire BAEC carreer expired unused ... Most frustrating was the recent experience when I tried LHR-KUL J to F, right on booking. Although upgrade was available (as expected on this route) trying to upgrade using GUF1 drove the J fare above F fare price - so I would actually have saved some money paying for F ... Obviously I happily decided to stay in J.