A father from Kent has said his young son was left "devastated" after his primary school banned him from his first school trip for bad behaviour.
Sam was due to go with his class to Canterbury Cathedral
Sam Cole, seven, suffers from Attention Deficit Hyperactivity Disorder (ADHD) and support groups claim he has been discriminated against.
The head teacher of St Mary's Primary in Dover said Sam was told several times his behaviour must improve.
But Sam's father, Michael, said his son has an illness he cannot control.
"I think it is disgusting," he said.
"There's a difference between someone messing about and disrupting a class and a child that has ADHD.
"ADHD is a mental illness."
Sam said he was really excited when he first found out about the trip to Canterbury Cathedral, but was later told he could not go because he was "naughty in the classroom and in the hallway".
St Mary's Primary said the decision to exclude Sam from the trip was not taken lightly.
A risk assessment was carried out to ensure the safety of all staff and pupils and Sam was told his behaviour had to improve to go on the trip.
The head teacher added that bad behaviour "should never be rewarded".
But Caroline Hensby, from the ADHD Support Network, said schools have to provide extra resources to include all children no matter what their disabilities are.
"ADHA comes under that category," she added.