St John House, located on The Walk in Potters Bar, is a two-storey building that served as a training facility for the charity since 2008. The ground floor includes a training hall, kitchen, offices and toilets, while the first floor offers additional office space, a kitchen and a meeting room. The building is positioned in a mixed-use area close to the town centre, offering easy access to retail, leisure and transport options. Potters Bar train station, just half a mile away, provides regular trains to London King’s Cross in around 20 minutes. St John Ambulance continues to offer workplace first aid and mental health training at other sites in Hertfordshire, including locations in Stevenage and Hemel Hempstead.