The type 45 is an AAW destroyer but there are very few nations now that have an air arm that could mount an attack against shipping.
Type 45 may well have been designed/envisaged as an AAW destroyer, & will no doubt undertake the role as part of the new UK CBG, but don't forget about the Type 22's / 23's, they were designed for ASW / ASuW.
What are their main roles now ??
Drug & piracy enforcement/control - Humanitarian relief, etc. etc. Things that most navies are having to do nowadays - Multi-task / multi-role, as no one has the funds to maintain large fleets of specific role vessels.
With a fully functioning carrier the threat should be kept away from any task group by its own air wing without having to rely on an aaw destroyer. I would have thought that the biggest threat to any carrier group is going to be submarines.This is certainly the approach of China.The ship I would be buying would be a next generation asw frigate.
Again, can ANY navy across the globe afford to run single role / task specific vessels ??
If the UK wants to retain it's Blue-water status (which the carrier replacement is all about), being part of the few nations that can project power 1,000's of miles from national waters, utilising mutirole vessels, that can operate as ASW one day, minefield clearance the next, then take over in the AAW or humanitarian duties is a given.
Unless of course, you want an arms race in proportion to the one that took place at the start of the 20th Century.... ?
Long live the Dreadnoughts !
Systems Adict