I am not sure, but I suspect that under JAR/EASA rules a second pilot will be mandatory.
My understanding of recent rule changes under EASA make two pilots necessary only where the aircraft doesn't meet certain IFR requirements.
Only a few years back police pilots such as Bertie Thruster and I were flying an unstabilised "floppy stick" helicopter single pilot by night, to an unlit base landing site, which was interesting at times, despite both of us being previously trained to fly military unstabilised SE helicopters IFR/IMC. There were some changes requiring at least a SAS not too long ago for police aircraft. IMHO it's a good thing that some of these things are now being introduced.