If it's any help I have been through a similar thing recently in that my referring hospital used to only offer bands so anyone having a bypass or a sleeve had to be referred to SGH in Tooting.
In July I was chasing my progress and was told that my local hospital was in the process of trying to set up their own lists for the more complex procedures and was waiting to hear if they had got the funding to do it. I asked what would happen if I was put on the list for SGH and then the local hospital was given the funding to expand their procedures, I was told that I MAY be given the option of swapping back to the local hospital but that it wasn't definite.
Then, when I got the letter giving me the outcome of my MDT, I was told that I had been put on the waiting list at my local hospital rather than at SGH. I have since found out that they had only confirmed the funding about a week before I went to MDT so they were able to automatically put me on the list for my local hospital and will probably do the same with people from my area as they come to MDT.
Good luck in getting surgery local to you - if you want to move hospitals but under the same group of surgeons then I would ask them, in writing if necessary, if you can be switched from one list to the other - after all, they can only say yes if you ask them.
Tatiana