D-Four was formed in late 2011 to meet the growing requirement in the public and private sector for experienced, independent, unbiased protective security guidance for high-value sites and assets. D-Four is not affiliated to any suppliers of equipment or installation companies. Our aim is to provide clear, independent, unbiased advice on security threats and counter-measures, based on CAPABILITY. This ensures no colouring of advice for clients. Our advice is based on the standards and approach demanded in JSPs 440 and 480 and recommendations for equipment, where requested, will centre on proven equipment from the SEAP CSE or that in current industry use. D-Four is currently carrying out security consultancy work for NHS, as well as a significant Government project and other large clients. D-Four are Full Members of the Association of Security Consultants.