The letter says the appointment can take up to 1 hour. What will happen?
I have been depressed and anxious forever many years and tried many drugs and CBT a few times. Nothing has helped i have no life 
I think I'm quite well informed and I have some ideas about what treatments I would like to try. Are they likely to be open to suggestions and sensible discussion (like a GP) or do they operate a on a 'do as you're told' policy?
I am very anxious about this. I'm worried they won't be able to help or will just take me off valium which is addictive but does at least help a bit.