The 'best evidence' GET works is much weaker than the best evidence (verifiable case histories maybe) that it actively harms some people, possibly many to some degree. And because more research is necessary, at present *no-one* can know who is who, so no way to tell who will be harmed ... but a number most definitely will.They are also likely to use the line that something is better that nothing and that withdrawing the current recommendations of CBT and GET would leave patients with nothing and NICE exists to provide everyone with something . If they have some words on a peace of paper they will sign it off...job done!!
And saying patients are given a choice by NICE regarding acceptance of treatments, the crucial point is it's an UNINFORMED choice but (mis-)guided by BPS-ingrained clinicians.