asked the Secretary of State for Industry what is his latest estimate of the cost of the Concorde programme up to 31st December 1975.

The latest estimate of the net cost of the Concorde development and production programme to the United Kingdom Government from the beginning of the project to 31st December 1975 is £627 million.

asked the Secretary of State for Industry up to what point in Concorde's development the British and French Governments are jointly committed to expenditure on the aircraft.

The British and French Governments have agreed to develop the existing version of Concorde to a point at which it obtains a certificate of airworthiness in the United Kingdom and France and meets the requirements of the two national airlines.

asked the Secretary of State for Industry what is the average overpressure, attributable to supersonic flights of Concorde, measured on land in the Scottish Highlands.

The average of the peak overpressures measured in Scotland and attributable to supersonic overflight by Concorde is 78·7 Newtons per square metre.

asked the Secretary of State for Industry why the two Concorde pre-production aircraft are not now to be refurbished to enable them to go into airline service; and what is to happen to these aircraft.

The two pre-production Concorde aircraft 01 and 02 were designed and built as part of the development programme to standards which are not now suitable for the requirements of airline service. Their work on the development programme is coming to an end but no final decisions have yet been taken about their future.