[GreyHoundSailor]

Perhaps the Brits could afford the Evolved Sea Sparrow. They come in quad-packs for the MK-41 VLS.

[Oztrich Boy]

Anti-air is not the problem. They will have a separate Sea Ceptor system fired from launchers smaller and shorter than even the selfdefence length Mk41.

Below Sea Ceptor quadpack in MK41. Note very loose fit