Researchers have called for better support for people with attention deficit hyperactivity disorder (ADHD), after a review found hundreds of thousands could be undiagnosed.

About 2.5million people in the UK have ADHD, NHS data shows. But researchers found cases are still under-diagnosed in older adults.

Researchers have called for better support for people with attention deficit hyperactivity disorder (ADHD), after a review found hundreds of thousands could be undiagnosed.