There are currently 800,000 people with dementia in the UK and 670,000 family and friends acting as primary carers, according to the latest estimates from the Alzheimer's Society.
The number of sufferers is estimated to rise to a million by 2021, and 1.7 million by 2051.
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Temperatures are predicted to reach a high of 23C.
Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.
Top temperature 24C/75F.