St Mark’s is a Catholic comprehensive school within the Diocese of Westminster. There are currently 1220 of boys and girls on roll including the Sixth Form. In April 2012 St Mark’s joined the Diocese of Westminster Academy Trust.

St. Mark's was rated ‘Outstanding’ by Ofsted in January 2009 (reports.ofsted.gov.uk/). The Diocese of Westminster also graded the school as "outstanding" in every category during the Section 48 Inspection in April 2014. The Sunday Times listed St. Mark's as the 13th best Comprehensive School in the country based on GCSE and 'A' Level results in Summer 2017.

The Mission Statement is central to daily life at St. Mark’s:

St. Mark’s is a Catholic School which has at its heart a love of God, the education of its students, and a mission to serve our neighbours and community. We seek to foster a spirit of truth, reconciliation, justice and peace. We are committed to developing the spiritual, intellectual, moral, cultural, social and physical potential of all our members within a safe and supportive environment.

St. Mark's is concerned with the education of the whole person and for this reason religious education is at the heart of the school, making explicit what is implicit in all areas of the curriculum. We believe that the outcome of religious education should be religiously literate young people who think spiritually, ethically and theologically and who are aware of the demands of religious commitment in everyday life. The existence of a chapel in the main school building, shows the commitment St Mark's has to ensuring that all pupils will have the opportunity to grow in their faith. Assemblies are an integral part of school life where the community joins together to pray and celebrate publicly the individual achievements of the pupils.

We have a wide range of extra-curricular provision and educational visits, both in the UK and overseas and you can read more about life at St. Mark’s in ‘Veritas’ which is our termly school publication.

“The School has achieved a near perfect balance of ensuring that pupils make great progress and attain high standards but at the same time develop into well rounded, independent caring, courteous and upright citizens”.  Ofsted