Utterly awful.
I had to phone a number I was sent in a letter, where I spoke with a woman who went through a tick-box form, asking me questions that weren't always relevant and offering a series of answers, most of which didn't apply to me and there was no option of supply my own answer, I had to respond with one of their accepted answers. At the end of this farce, I was told 'ah yes, you are suitable for CBT.' I thought this was bollocks at the time, because I didn't think that was what I needed, but I went along with it because what do I know? I'm not a psychotherapist. (By the time I actually went along, I was optimistic about it helping.)
I was heavily sold group therapy, despite my repeated explanation of why it wasn't for me. I refused it and said I would go back to my GP and explore other avenues as there was nfw I was discussing my issues in front of total strangers who had no obligation for confidentiality.
At this, I was offered some appointments, one to one, with a trainee who was very nice but came across as being rather dim. Some people are people people, some are incredibly academic but unable to really connect with others and have been trained within an inch of their life to follow the party line - she was the latter.
The sessions were a total waste of time and money and according to the information I was later shown, actually made me more depressed! They didn't help me and I felt like a total failure, and I would get so anxious before going and I would have flashbacks of experiences in the past, where I would be dreading going somewhere. It was awful.
In the last session I filled in a form and was pressured into adding a bit on the end about how my increased anxiety and depression wasn't my therapist's fault. 
The word I would use to describe my treatment is 'damaging.'
I have had my ADs increased in dosage twice since then. I wasn't listened to, I was treated as a number and a statistic, and I regret ever seeking help. I'm under the impression that if you can't get better within their timeframe, you can fuck off. I don't think a dr would stop your ABs because an infection hadn't fully cleared up, you'd be given another week's worth or put on a different AB. No one would say 'ah, yes, your three chemo sessions haven't completely cured your cancer, so rather than explore the possibility that you need more doses because your tumours are more troublesome than the average, we'll just let you die because you haven't conformed to our treatment plan.'