People with an intellectual disability have experienced increased life expectancy (Emerson, Glover, Hatton, & Wolstenholme, 2014), resulting in changing healthcare needs, including age-related mental health conditions, such as dementia (Whitehouse, Chamberlain, & Tunna, 2000). Dementia is an umbrella term used to describe a group of symptoms and includes a wide range of diseases and disorders of the brain. Although with differing fundamental causes, they all result in progressively deteriorating intellectual functioning and loss of daily skills (Prasher, 2005). Nevertheless, how the dementia is experienced is informed by a combination of neurological impairment, psychological factors such as health and individual psychology and socio-environmental factors (Kitwood, 1997). In almost all aspects, dementia presents in a similar fashion for people with an intellectual disability as for those without; however, two striking differences are that people with an intellectual disability, particularly people with Down syndrome, are at an increased risk of dementia, which is likely to have an earlier onset (Strydom,