The first fully compliant airframe has been delivered to EAAA [at the recent BGAD show] and training has started.
The Waypoint article jumped the gun a bit so some of the detail is slightly off the mark [they did not have a document to work from simply because it did not exist until after they published] but it is minor.
There are now three AA declared for Night HEMS, two have ordered [EAAA and Midlands] the third [North West] declared today. BASL were miffed when AA's went off buying their own, thereby cutting them out of the 'lotsa money' lease frame but the new model with Night HEMS appears to be about keeping them in the fold even when the ownership goes to the charity.
I would guess [no more] that having BASL as 'Night HEMS central' will offer significant savings in training costs to those AA's going this way. Placing the onus on BASL to provide the Night HEMS capable pilot will probably reduce the required number of such pilots. The unknown question though will be the left hand seat Paramedic as he will certainly be of the specific AA.
Early days.