[1] Univ Lancaster, Inst Hlth Res, Lancaster LA1 4YW, England
[2] Fdn People Learning Disabilities, London, England
[3] Inst Psychiat, Ctr Econ Mental Hlth, London SE5, England
[4] Helen Sanderson Associates, Manchester, Lancs, England
[5] Valuing People Support Team, Dept Hlth, Manchester, Lancs, England
[6] Univ Hull, Kingston Upon Hull HU6 7RX, N Humberside, England
[7] S London & Maudsley NHS Trust & Kings Coll London, Estia Ctr, London, England