I think I will wait a bit before I buy.
I got Gold last time, which I thought was a great package, I got photos with all the guests including Ben.
Gold is not as good as last time, so I would want to go for Platinum, but that's a lot more money. If I'm going to get Platinum, I would want to know that there was at least a chance to meet Ben and/or Martin. If there is no chance of a photo shoot with one of them, I might just get a standard ticket and buy the photo shoots / autographs that I really want (Rupert Graves, Andrew Scott, Una Stubbs).
There's no mad rush, I don't think I bought my ticket straight away last time.