Hi Jessoliver,
I can only offer my personal experience of timescales (in the London) area. My timeline was like this:
-- Jan 2011 ..... referred by GP
-- Feb 2011 ..... received letter from Whittington inviting me to attend Info seminar in
June 2011 (some people would have phoned and kept enquiring about cancellations or earlier Info session dates but I did not bother at the time -- I just thought, take it as it comes)
-- June 2011 ..... attended Information / Education session and first Whittington bariatric patient support group
-- Aug 2011 ..... my GP applied for funding
-- Sept 2011 ..... funding approved by Greenwich PCT
-- Sept 2011 ..... first consultant appointment and first tests (bloods etc)
-- Oct 2011 ..... endoscopy test
-- Nov 2011 ..... lung function test
-- Dec 2011 ..... sleep apnoea test
-- Jan 2012 ..... full ECG + heart scan
-- Jan 2012 ..... 2nd consultant appointment
-- Mar 2012 ..... pre-op assessment and start of pre-op diet
-- 17 April 2012 ...... operation date (16 months after referral)
I didn't have to jump any other hoops (dietician or psychologist) based on my recorded eating habits -- therefore only had to go thru the tests that were relevant to my personal circumstances.
FUNDING: BOSPA - The British Obesity Surgery Patient Association
this link will give you an idea what your own local PCT is like regarding funding and whether they follow NICE criteria (BMI above 40 with co-morbidities, or BMI above 50 without).