The UK has undertaken, through international MOU arrangements, to procure 232 Typhoon aircraft in three tranches. So far, the UK has contracted for the delivery of two tranches, comprising 144 aircraft. Decisions on Tranche 3 will be taken in due course, in conjunction with our partner nations, once we have analysed and considered the relevant information. The estimated cost of the Eurofighter Typhoon programme is commercially sensitive information which is protected in order to maintain our negotiating position for future acquisitions on the Typhoon programme. It is therefore inappropriate to speculate on the lifetime cost for either of the options outlined.