Yeah...the Astute class subs are armed with Block IV Tomahawks, those don't carry nuclear warheads so that sub can put a couple dozen 1000 pound conventional warheads on target. The Astutes can do exceptional conventional work tho, if any targets worth hitting show up.

They are good attack subs, roughly equivalent to our Virginias.

Fun fact, our subs can and do carry nuke warheads.