The inter-war Naval Treaties did not draw a distinction between battleships and battlecruisers. They referred to "capital ships". The 1922 Washington Treaty named the capital ships each nation could retain. For Britain that included 4 battlecruisers - Tiger, Renown, Repulse and Hood. Under the 1930 London Treaty Tiger, along with 3 of the Iron Dukes were to be scrapped with the fourth, Iron Duke, converted to a training ship. The ships on the lists were each navy's most modern at the time.The tendency of the RN to treat its battlecruisers as battleships to give it 15 capital ships was understandable in these circumstances.