How many of us will end up being diagnosed with ADHD?

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The number of people taking medication for Attention Deficit Hyperactivity Disorder - or ADHD - is at a record high. Since 2015 the number of people prescribed drugs for the condition has almost trebled. Concern about this rise in demand has prompted the NHS in England to set up a taskforce. So what's going on? The BBC's health correspondent Catherine Burns explores whether ADHD is becoming more common, if we're getting better at spotting it or if it is being over diagnosed.