I remember once I was on the X24 and these two people got on, one with bus pass, another with carers bus pass, and it was before 9.30, so they would have had to pay full price, but they had the docotors appointment but the carer couldn't get through his head that only the one with the actual pass could get on for free (or 50p not sure), but the carer was just arguing with the driver and at the end the driver relented and just let them on.