We will conduct a randomised controlled parallel arm trial where participants will be randomised 1:1 to a bariatric surgery pathway or to a community based Weight Watchers diet programme. Sixty four participants (32 to each arm) will be randomised.
The trial will necessarily be open label due to the nature of the intervention though assessors of visual tests, cognitive tests and sleep apnoea tests will be blinded to treatment. The primary outcome, ICP, is not a subjective measure.