North Somerset Royal I have used my Maestro card on several occaions but it always takes 3 or 4 attempts before the system will accept it. I think its just a crap system.
PS THIS SYSTEM IS NOT SO GOOD EITHER AS ITS JUST DUPLICATED MY POST
Perhaps, just maybe, it is your finger trouble rather than the HNA or club ticketing systems that is at fault? I have never had a problem with using Maestro to book tickets.