asked the Minister of Health on what date he approved an extension of the arrangements for poliomyelitis vaccination to provide a fourth dose to children between 5 and 12 years; on what date this information was received by the Middlesex Executive Council; and on what date this information was sent to general practitioners in the area of Willesden.

My right hon. Friend announced this extension in reply to my noble Friend the Member for Hertford (Lord Balniel) on 12th April. The Department's circular letter was received by the Middlesex Executive Council on 13th April. Printed notices to general practitioners in the area were distributed on 5th May.