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UK Disability Forum is a discussion board (on-line forum) for disabled people; postings on issues relating to physical disability dominate, but check index page for range of topics covered
United Response is a major service-provider with charitable status, supporting people with learning disabilities; founded in 1973 with just one service in West Sussex; now supports 2000 people and works in over 300 locations across England and Wales.
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Youreable Forums: a suite of forums run by the charity Disabled Living Foundation (DLF); topics include health, benefits, work, disability rights etc.