You must have been looking at the wrong page in the First Capital timetable, since there are normally two all-stations trains per hour between Luton and St Pancras International. My complaint is not about the lack of available (slow) services but the need to restrict bus-pass holders to the use of such services, especially during the off-peak when many trains are lightly loaded anyway. And remember you cannot return during the peak hours on this line due to an earlier restriction which First Capital introduced soon after taking over the service. I have made my feelings known to the staff at the ticket office (yes, I know it's nothing to do with them, but word does get back if enough people complain) and have also written to Customer Services. But in a way this unwelcome change has actually done me a favour, since the free Green Line coach run is a more pleasant and comfortable alternative and compared to a slow train takes much the same time. Oh, and you can return whenever you like even during the peak hours with a half-hourly service. Some drivers will drop you off at Luton town centre before continuing to the airport , not the other way round as scheduled - yet another bonus.