No, it really is just open to golds. When Mrs Antichef and I were coming back from a wedding in the Antipodes last year I booked well in advance - have not done that in years!! About four months rather than 48 hours or less. At that point the cabin was empty.

I got 1K as a gold but as she is silver, could not get her in into 1A. Put her in 2K - which is probably better than 1K to be honest.