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The boy, who cannot be named for legal reasons, was released on police bail while enquiries continue.

A Tring School spokesman confirmed there was incident where a "small number of students took a prohibited substance".

"As soon as they became aware of the issue the school Leadership Team called for an ambulance as a precautionary measure as well as police support," they told the Gazette.

"Any consequences for the students will be as set out in the relevant school’s/trust policy.

"Should there be any further action initiated by police then that is outside of the school’s knowledge or control. All of the students involved are safe."

Boy, 16, arrested on drugs charges after incident at Tring School