Even if the pilot had a valid Instrument ticket (hopefully current) and a commercial rating ( a glorified PPL unless further training, hour building and type ratings are added) the fact that he was a full time plumber would just not leave this poor guy the time, on the job training and constant daily real world commercial flying standards experience to be competent enough to be running on-demand “charter” flights safely. I’ve got a FAA CPL IR with all the trimmings and have flown my puddle jumper from Rennes to Swansea a few times in day VRF, to try it at night in low or no viz with ice forecast is suicide.