The National Audit Office Major Project Report 2012 provides the total approved cost for the UK F-35 as £2,716 million and the forecast cost as £2,344 million. The Major Project Report 2013 is due to be published in the near future and will provide the next update on UK F-35 costs.
The incremental nature of the F-35 approvals means that the total cost of the programme is updated after each Main Gate is endorsed. At this time the cost estimate reflects the first three Main Gates, with the fourth yet to be formally announced. The UK F-35 programme is scheduled to seek financial approval for its fifth and final main gate in 2017. At this point the overall cost of the programme will be published. Whilst the Ministry of Defence maintains a detailed through-life cost estimate for the programme which forecasts all Main Gates it does not publish these figures ahead of formal contract negotiation in order to protect our commercial position.