HC Deb 09 June 1981 vol 6 c99W
Mr. Deakins

asked the Lord Privy Seal if the United Kingdom's through-deck cruisers count as aircraft carriers for the purpose of the provisions of the Montreaux convention.

Sir Ian Gilmour

The United Kingdom's Invincible class, previously described as through-deck cruisers, are now designated as anti-submarine warfare helicopter carriers. The British Government's view is that these vessels should be regarded as aircraft carriers for the purposes of the convention.