Article 4 Directors of the trust Changes not yet applied. Later legislation changes this provision in ways not yet written into the text below: art 4 am by London Ambulance Service National Health Service Trust (Establishment) 2004 art 3 art. 4 words substituted by London Ambulance Service National Health Service Trust (Establishment) 2014 art. 4 The trust shall have, in addition to the chairman, 5 non-executive directors and 5 executive directors. ← Article 3 Article 4 Article 5 →