Miltoncross Academy (formerly Miltoncross School) It is a coeducational secondary school located in the Milton area of Portsmouth in the English county of Hampshire. The school is situated on the site of the former 'Priorsdean' Hospital for infectious diseases, which was established in 1884. Miltoncross School opened on the site in September 1999, but did not move to the building it is housed in until 2000.