Perhaps a link for everybody to add to their favorites, the official Eurocontrol ICAO callsign directory. It's fully searchable using spoken callsign, operator or the ICAO designator.
http://www.eurocontrol.int/icaoref/i...ors_browse.jsp
Typing in "Blackadder" in the callsign (Telephony) box reveals it's allocated to:
Bournemouth Commercial Flight Training Centre & they have the ICAO designator BLD
FC