An enlarged Type 45 after the Falklands War

How could the loss of two Type 42 destroyers and two Type 21 frigates in the Falklands lead to the heavily armed Type 45 in the Canadian Power alternate history?

The losses could trigger a determination to prevent another gap in layered defence, although the imagined design still overinvests in weapons.

The Canadian Power alternate history gives its Type 45 a 144-cell missile battery: groups of 64 and 48 Sylver A70 cells plus 32 Mark 48 cells. The 10,720-ton hull also carries twin 155 mm guns, two quadruple Harpoon launchers, close-range guns, and two triple 324 mm torpedo-tube mountings. The scenario links this enlarged design to the loss of two Type 42 destroyers and two Type 21 frigates in the Falklands. Those losses could create a political demand that no future ship lack layered protection. The response treats the imagined fit as an excessive expression of that demand, joking that even its guns look restrained beside the rest of the armament.