ADHD is a disorder that is defined through analysis of behaviour. People with ADHD show a persistent pattern of inattention and/or hyperactivity–impulsivity that interferes with day-to-day functioning and/or development.

ADHD UK

ADHD UK is a website which has lots of information and support for parents and those living with ADHD. Their website can be found here. 

Mind

Mind is a website which supports Mental Health. This website can be found here.