asked the First Lord of the Admiralty what arrangements he has made for an increased supply of thermionic valves, in view of their increasing use in modern naval gunnery and radar equipment.

The production of thermionic valves is planned by an inter-Departmental Committee, and I am satisfied that all practicable steps are being taken to meet the requirements of the naval programme.

Will my hon. and gallant Friend keep this matter under review to make sure that an adequate reserve is built up, and perhaps to overtake am, deficiency in supply which may have arisen under the previous Government?

Yes, Sir.