EHarding ........... point us at a reference allocating those callsigns to those units (on VHF) , that would be lovely.
The definitive list is maintained by ICAO in document 8585. Can't find a link on the ICAO site but the Danes have this one
ICAO DOC 8585
Comes in three parts and contains a worldwide listing. Each part is sorted differently ie. by Company, by Callsign or by three letter designator.