The Division of Clinical Psychology (DCP) of the British Psychological Society (BPS) invited Professor Ken Zucker as a keynote speaker to their annual conference in December 2010 (BPS, 2010). Zucker works at the Toronto Centre for Addiction and Mental Health (CAMH) and is considered an authoritative figure in the controversial diagnosis and ‘treatment’ of children with ‘Gender Identity Disorder’ (Hill et al. 2006). He is also Chair of the American Psychiatric Association’s (APA) Sexual and Gender Identity Disorders Work Group for the DSM-5 (APA, 2010). His invitation was proposed by the DCP conference committee expert group who research potential speakers for the division (J. Unwin, personal communication, November 15, 2010). This invitation sparked an angry and concerned response from many. Zucker’s work at the CAMH GID clinic has been widely criticised by academics (e.g. Wilson, 2000; Wren, 2002; Menvielle & Tuerk, 2002; Hird, 2003; Langer & Martin, 2004; Lev, 2005; Bryant, 2008), organisations (e.g. Burleton, 2008; Choe, 2008; Queerty, 2009) and individuals concerned with LGBT issues and gender diversity.