The official secrets act 1920 made it an offence to onstruct HM forces ‘in the vicinity’ of a prohibited place.D had caused an obstruction in the prohibited place ,It was argued that he was not guilty as the literal wording of the act did not apply to anyone in the prohibited place .It only applied to those ‘in the vicinity’, is outside but close to it .The judge held that words should be read as being ‘in or in the vicinity of’ the prohibited place .D was guilty