Hello Mummy Katie,
I don't think you have to " apply" for platinum card... all you have to do is to spend a certain amount during a year ( or more years??) and they'll upgrade you to Platinum card... as to how much you have to spend?? I'm so sorry... I really forgot the requirement.... ( plus, I really don't want to remember as my husband will be so shocked ! hahhhahahah)
I think the difference with a regular gold and platinum card is only the parking privilage and you can enter the VIP room at IFC for free snack and drinks!
Yes, nice to meet you katie... and honestly, I like your spelling better,... just that I was born with this name already....