I think the important point I'd like to make at the outset is that when the review of the requirement was carried out it was carried out both nationally and on a four nation basis, the ministers, once that was complete, the ministers decided that and stated publicly in December ninety two, that  we will continue with the existing airframe and engine combination and that each nation er based on a family of aircraft concept could decide from a menu which equipments it would fit according to their individual requirements and their budget and  we looked individually at each of the items to see what impact it would have on the operational capability if we were to remove them and what erm was decided in the end and the requirement reflects this, was signed last month by the Chief Surveyor's staff, is that some nations have decided to remove certain items of equipment but for the U K we felt that it was necessary to keep all the major items and therefore as far as the U K is  erm impact on the operational requirement is concerned, there is no significant alteration in its operational capability and therefore in overall percentage terms there is no  decrease in the capability at all.