asked the Prime Minister if she has received an explanation from the Dutch Government as to why they did not inform Her Majesty's Government of security breaches at the joint centrifuge project, at Urenco, Almelo, until four years after the information was known to them.

The extent to which the significance of Dr. Khan's activities in Holland was fully appreciated within the Netherlands Administration is one of the issues examined in the report prepared by an internal working party of the Netherlands Government. A copy of this report has been received in confidence by the United Kingdom. No decision has yet been taken by the Netherlands Government to publish it and I cannot discuss its detailed findings.I have made my concern about the Khan affair very clear to Mr. van Agt, the Netherlands Prime Minister, and we remain in close touch with the Netherlands and German Governments through diplomatic channels and in the Urenco joint committee to ensure that all the necessary action to prevent a repetition is being taken.