I had to go to google to see if i could find out anything, and the only thing i could come up with was this item from Scotland. http://www.ohb.scot.nhs.uk/images/pd...y%20200711.pdf
Your best bet, i think, would be to ask your doctor, or call the hospital, or call the surgeon's office.
The interesting thing is that the document from Scotland said that the time from approval to surgery was about 9 weeks, but it could take up to a year to get approval. That's a little longer than here in the US, but not that much longer. We generally have to go through 6 months of supervised weight loss and then have a whole bunch of evaluations. I'm sure the process is similar in the UK.
So, that's also why it's REALLY important that your doc put down on the referral that you've completed a supervised weight loss plan, along with a gym membership. he's definitely in your corner here.