LimeJelly - I'm sorry you are going through this, it is a shock when you receive such a diagnosis. With regard to the hospital choice, I'm not sure what to suggest, I would say sentinel node sampling is an absolute must, (I'm not sure what gold standard means?)
I would bear in mind whatever hospital you choose, that if you need chemo (and hopefully you won't)you will need to travel to the hospital fairly frequently and most of the time you won't feel very well - so thats a consideration if Hospital is a distance away.
With regard to waiting until mid jan for your op. - its unlikely that will make a difference.
I can tell you that the NHS treatment I have received (DX 2 and a half years ago)has been excellent.
As for what questions to ask, - I would suggest write down anything you can think of, - it's easy to forget things in the anxiety of the moment. If you can take someone with you for support, I would recommend it. You will have a breast care nurse - she will be your life line as it were - they can be phoned and consulted whenever you need it, whether for clinical info. or just a shoulder to cry on.
As far as surgery is concerned, you might want to ask about the practicalities - healing time, chances of lymphodema (flud build up you can get when you have lymph nodes removed), whether you would like reconstructive surgery (depending on what type of surgery you have).
It's a difficult time, - and I'm happy to answer any questions you may have.
If you look down the threads on health, you will see the 7th Tamoxifen thread, - we are a BC support thread - hand holding is our speciality - you will be made very welcome, - we've got a variety of experiences between us, and there is always someone around for a friendly chat
lots of love and good luck xx