Deffry Vale High School

Deffry Vale High School was a school located in England. It was infiltrated by the Krillitanes and was brought to to attention of Sarah Jane Smith and Mickey Smith (separately).

The Doctor and Rose were undercover in this school during the final stages of the Krillitane's plans.

Deffry Vale High School was destroyed when K-9 destroyed a vat of Krillitane oil.