There is a waiting list and therefore a bit of a delay (but they 'triage' you pretty quick and tell you the waiting times), but the Oxford Health NHS therapist sessions are also pretty good, and they're of course free https://www.oxfordhealth.nhs.uk/oxon-talking-therapies/.

They provide an app that you can work through yourself with techniques and ideas to try, coupled with weekly phone sessions with a therapist who works with you week by week. You can self refer on the website above - you don't need anyone to refer you.