Further to previous posts, I'd reckon Sea Darts could be transferred from an RFA, but fitting Tridents at sea ??!
If no other navy uses Sea Dart, what do the Argentinians ( I know I've read recently one of their two Type 42's is in poor condition & refit ) and other recipient navies use then ?
BTW HMS Southampton sailed past me twice in the Solent this last Thursday, possibly using the measured mile for calibration of some kind; I guessed at the time she's not got long to serve, as she hasn't been given a 'Chrighton' gun.