Dr David Tuller from the University of Berkeley, California has penned a very critical blog on IAPT http://www.virology.ws/2020/01/15/trial-by-error-cbt-provides-no-benefits-to-advanced-cancer-patients-study-finds/
two years ago he was one of the authors of a reanalysis of the PACE trial data on the efficacy of CBT for chronic fatigue syndrome and essentially found the data had been fudged.
Dr Mike Scott