A British battleship hull as the template for a nuclear cruiser

Which British battleship design would be the best template for a nuclear-powered cruiser?

Lion is the tentative battleship choice, followed by a preference for a fully armoured battlecruiser approach.

Lion is the tentative battleship choice for the basis of a nuclear cruiser. A fully armoured battlecruiser is then preferred as a design approach. This brief preference supplies no reactor arrangement, weapons fit or displacement estimate.