The Health Secretary has accused doctors of refusing to carry out tests for dementia because they believe it is pointless as there is no effective cure available.
Jeremy Hunt said the country should be "ashamed" that so many people were being denied treatment which could stave off the condition for years.
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Police said the child, who was without a driving licence, was trying to make his way 2,500 miles from the east coast to Perth.
The 24-year-old was charged with 14 counts of wounding with intent to do grievous bodily harm and one count of throwing a corrosive fluid.
Winds will veer northerly overnight with colder air streaming in over the next few days.