It is Blackbushe. Using the precedent created by Ryanair when describing flights to capital cities such as Rome, Glasgow, Brussels etc a facility some distance from the advertised destination is employed as in London Oxford, London Southend and London Ashford. So Blackbushe is soon to become West London Heliport, it could also be the West Surrey or North Hampshire Heliport but it is still Blackbushe.