<unk>  (or<unk>  Strategic Health Authority") was a strategic health authority of the National Health Service in England. It operated in the<unk>  region, which is coterminous with the local government office region. The authority closed as part of the Health and Social Care Act 2012 on 31 March 2013.<unk>  provided strategic leadership for all of the NHS health services in the capital.<unk>  overall responsibility for the performance of 31 Primary care trusts, in 6 clusters, 20 acute trusts, three mental health trusts and the<unk>  Ambulance Service. A further 16 trusts in<unk>  are self-governing as foundation trusts. Its first Chair was George Greener, who was replaced after his resignation in September 2008 with Sir Richard Sykes. The final Chief Executive was Ruth Carnall. Richard Sykes resigned as Chair in May 2010 over the incoming government's decision to halt planned hospital reorganisations in<unk> , which included closure of A&E and maternity units and the building of new polyclinics. Professor Mike Spyer, became the Interim Chair of the Board in 2010 and was confirmed as the permanent chair in 2011.
NHS London
NHS North West
NHS East of England
NHS Wales
NHS England
Ms B v An NHS Hospital Trust
NHS Digital
Helen's Trust