Deep Vein Thrombosis Mr. John Smith To ask the Secretary of State for Transport if he will undertake an inquiry into the incidence, extent and cause of deep vein thrombosis among British air travellers, with specific reference to the case of Sara Newman. [114968] Mr. Jamieson The Government are already helping research into the incidence, extent and cause of deep vein thrombosis among air travellers being carried out under the auspices of the World Health Organisation.