The pre-dreadnought preserved in Japan was built in the UK wasn't it? That's better than nothing. Such a pity Warspite wasn't kept as a museum ship, as I understand there were moves made in that direction but nothing came of them, meanwhile the ship just wouldn't go to the scrappers quietly. Best looking post-war naval ships undoubtedly the County Class, be nice if one were kept. What's the current situation with the Plymouth and her companions? Last I heard Bronnington was up for the chop.
My scene is more WW2 small wooden ex-service craft, there are a few enjoying very good care at the moment in the UK, HDML 1387 Medusa (owned by a trust) received a lottery grant for a rebuild, Vosper prototype MTB 102 continues to be well maintained, RAF HSL 102 and RN MGB 81 are in private ownership, completely rebuilt and running modern diesels. The Fairmile Bs of the Western Lady Ferry Co have been on the market for a while, there are rumours one may be taken on by someone with the means for her restoration and return to original configurqation. Sadly however many famous types are no longer represented, not even by shabby old houseboats (e.g. the Fairmile D).