TRT therapy takes many months and to costly for the NHS along with training and its not down to if its effective or not but down to funding/cost/training audiology have to pay for themselves.
Indeed @glynis treatments like TRT, CBT, Mindfullness, sound therapy can all help tinnitus. However, if a person has a negative mindset these treatments are unlikely to work. I will give readers an example for I know you are already know what I am going to say.
A member in this forum recently told me that he's going to start CBT soon but said this: " I know already that it isn't going to help my tinnitus but I'll go to the therapy anyway". With that type of attitude he will never habituate to tinnitus and is only going to the appointments because the country where he lives the treatment is free.
Michael