They were two of the youngest teams to enter the event and did exceptionally well, completing the marathon within two minutes of each other, both around 4 hours 36 minutes.
Many of the participants running alongside the boys commented on how wonderful it was to see them all taking part.
The marathon was part of the boys’ boarding house commitment to choose a charity to support each term and this was the first fund-raiser of the summer term.
Housemaster Matthew Pitteway said: “The boys were described as an ‘inspiration’ on more than one occasion.
Boys from Y10, all aged 15, were: Greg Firth (Hindhead), Matt Yeates (Switzerland) Charlie Costello (Wimbledon) and Declan Thompson (Fulham).
The Y12 boys, all aged 17, were: Ben Haynes (Chichester), Max Stembridge (Hampshire), Will Norton (Chichester) and Ollie Crowe (Streatham).
Acting headmaster John Green said: “Seaford College is renowned for its excellence in sport – although marathon running has never before been a particular forte of ours!
It was a terrific achievement for the boys who took part and great experience for them, as well as encouragement to go on to try even bigger and better things.”