Hi Tracy welcome to the group.
I'm from Croydon and had my sleeve done at Kings College. A lot depends on where you sit BMI wise in your PCT's guidelines. Mine was over 50 and the guidelines here said that surgery would be the first option, that's not always the case though remember these are just guidelines. I had tried various diets and prescribed slimming tablets for many years before MY GP referred me but after referral by my GP I saw the surgeon within 3 weeks and was put on the list straight away. I had lung function test and a sleep apnoea test 3 weeks after that, and then nothing for nearly a year when I received the letter telling me to go in for my pre-op assessment with surgery 10 days later.
Thats my "journey" it really couldn't have been more straight forward. I hope yours is as smooth