Wes Streeting is right to examine questions of overdiagnosis

Suzanne O’Sullivan, the author of the book The Age of Diagnosis, which Dr Richard Hassall says was too quickly dismissed by John Harris in his column. Photograph: Phil Fisk/The Observer

John Harris is misguided in his criticism of Wes Streeting’s review of UK mental health services (The right’s callous overdiagnosis bandwagon is rolling. Wes Streeting should not be on it, 7 December). While this review will inevitably examine questions of overdiagnosis, Harris is wrong to imply that Streeting’s main motivation is political. There is nothing unusual, of course, about ministers making decisions based on political considerations, but there is rather more to the review than Harris indicates.

It hardly needs restating that mental health services are grossly overstretched and underresourced, and an inquiry is necessary. This is a particular problem in child and adolescent mental health services (Camhs). When I was working as a clinical psychologist and involved in a Camhs autism diagnosis team 15 years ago, the waiting time for an autism assessment was around four to six months. Nowadays a waiting time of up to two years is common.