Much as I admire the A-10, and after seeing them ( and more to the point, their pilots' skills ) at West Freugh I certainly do, I would reckon the chances of embarking on a Naval version development programme just for the UK about as likely as Elle McPherson ringing me out of the blue saying she's always wanted to run away to a tropical island with me...
If going for such a task as pirate knobbling, there are 65 airframes ( I have reason to believe that's accurate ) with even better STOL ( ! ) capability, seagoing proven, languishing at Cottesmore; OK, no guns which is a sad story, but rocket pods of various types should make something of an impression; they could even be used on a SCADS/ Atlantic Conveyor style ' Q-Ship ' ...