What larger Type 45 and Type 26 variants would add

What differed between the larger Type 45 and Type 26 proposals?

They generally offered more missile cells, fuel, stores, aviation facilities and mission-bay space. Type 26 alternatives also offered greater power redundancy.

Larger proposals usually carried more vertical-launch cells, while Type 26 alternatives also offered greater power redundancy. Extra volume could provide larger mission bays and helicopter hangars. A ship still needs much the same sensors and computers to operate a weapon system when its missile capacity is smaller. Enlarging the hull can add fuel, food and magazine depth around an already substantial systems fit. Those additions support longer deployments and operational flexibility. Larger ships cost more to an extent, but extra capacity can ease later changes. Much of that adaptability must be allowed for in the original hull, since additions can otherwise force the removal of existing equipment.