Unless it is poverty spec (ex-emergence services) I believe the High Performance kit is standard fit in the UK.
The Premium kit is identified by a badge in the center of the dash below the CD slot. It will either read Premium Sound or Harman Kardon in later models.
If in doubt, check the spec list using VIN number with your local friendly dealer or the gurus at Bells can help:
https://www.volvoforums.org.uk/showthread.php?t=195895