Which Royal Navy ships are receiving deep refits?

Which Royal Navy ship will next receive a deep refit?

The Type 23s are already receiving extensive work, and the Type 45s are also undergoing substantial refits.

The Type 23 frigates are already receiving extensive life-extension work, while substantial refits are also under way for the Type 45 destroyers. Both cases involve more than routine maintenance because machinery and combat capability are being renewed. The comparison connects the earlier age-of-sail discussion with a modern reality: an existing hull can receive changes deep enough to restore much of its operational value. It does not imply that every refit is equivalent to building a new ship.