Useful ships from occupied European navies

Which ships from occupied European navies would have been useful in British hands?

He favours Norwegian, Greek, and Danish destroyers, but not obsolete and largely unmodernised Greek pre-dreadnoughts.

Useful ocean-going destroyers take priority among vessels from occupied countries that could have helped the Royal Navy. Norwegian destroyers beyond the small harbour-defence craft are joined by capable Greek and Danish destroyers. Yugoslav ships draw less enthusiasm in this answer. The old Greek pre-dreadnoughts are rejected because their lack of modernisation made them liabilities rather than ready reinforcements.