Sevenoaks Prep School is a preparatory school in Sevenoaks in south-east England. It is situated in the London commuter belt. A mixed school of some 380 children, there is a significant proportion of pupils from international backgrounds. The School is situated on the Sackville estate, on grounds bordering the park of Knole House. It is the venue for the Thomas Trophy, an annual cross-country running event which attracts many hundreds of competitors from schools across South-east England.