I’m just sending hugs.. I’m also from the uk.

Feel free to post as much as you want to. I don’t think you were a burden to the therapist. I’m sorry it ended abruptly, Your feelings of anger and sadness are completely normal (((( hugs ))))

(Edited to add)
There are other resources in the UK, but aside from private therapy I haven’t looked into them much. Group therapy might be a possibility if you have an amenable GP who might refer you. I personally haven’t found CBT helpful. I’m glad you had a good relationship with the therapist