Alleyn's Regent's Park, formerly North Bridge House Preparatory School, is a co-educational prep school situated in Greater London, adjacent to Regent's Park. Housed in a former convent, the school caters to children aged 4-11. It joined the Alleyn's Schools Group in September 2025. The school claims to focus on a knowledge-rich curriculum and a supportive community, alongside character-building experiences and a broad extra-curricular programme, preparing pupils for future senior school pathways.

North Bridge House Senior Canonbury is a co-educational day school for students aged 11-18, situated in leafy Canonbury Square, Islington, Greater London. Housed in a Grade II listed Tudor building with gardens, the school operates with an ethos of "high support, low pressure" to foster academic success and personal development. The school claims to focus on a personalised approach to learning, encouraging independence and intellectual curiosity. It provides pastoral care and is academically non-selective.

Southbank International School (Westminster) is a co-educational day school situated across three urban sites in Central London, near Regent's Park. It offers the International Baccalaureate Middle Years Programme (MYP) and Diploma Programme (DP) for students aged 11-18. The school emphasizes internationalism, with a diverse student body representing over 60 nationalities. It was previously awarded an "Outstanding" rating by Ofsted in 2017.

Charterhouse Square School is an independent, co-educational day school in the City of London, educating pupils aged 3-11. Situated within the Barbican area, it offers an urban setting with access to Charterhouse Square Gardens. The school claims to focus on academic success within a nurturing, stimulating, and "home-from-home" environment, fostering individuality with no uniform and a first-name basis between staff and pupils. A 2023 ISI inspection rated it "excellent" for academic and personal development and met all compliance areas.

North Bridge House Senior Hampstead is an independent, co-educational day school situated in Hampstead, North London. Located behind Hampstead's High Street, the school offers views of the London skyline and provides access to nearby Hampstead Heath for outdoor activities. Founded in 1987, it caters to students aged 11-16, though it is transitioning to Alleyn's Hampstead in September 2026 to become an all-through school for ages 2-18. The school claims to focus on individualized learning through a 'high support, low pressure' model, fostering academic success, resilience, and creativity within a diverse community. Facilities include a multi-purpose sports hall and specialist rooms for arts, sciences, and technology.