Essex St Mary's, Colchester St Mary's, Colchester is an independent day school for girls aged 3 to 16. Day Girls Pre-Prep Prep Senior 400 to 700 pupils Contact Details 91 Lexden Road, Colchester, Essex, CO3 3RB www.stmaryscolchester.org.uk More pre-prep and prep schools in Essex Brentwood School Chigwell School St Aubyn's School View more Essex schools. More senior schools in Essex Brentwood School Chigwell School View more Essex schools.