St Barnabas has a number of links with other parishes and organisations which include the following:
Working alongside St Stephen with St John, Westminster for morning and evening prayer (and compline on Thursdays)
World Day of Prayer (formerly Women's World Day of Prayer) across the denominations in Westminster
The Melkite Church in London, who are based in St Barnabas and have been since 1990 - this is an ecumenical partnership (also recognised by Prince Charles)
Parishioners are governors of local primary schools
Fr John works with the parish school and the local squadron of RAF Air Cadets
Westminster Interfaith Leaders Forum
Westminster faith exchange and SACRE
The Grosvenor Estate