I was out and about yesterday near Glasgow Airport when G-VMIK (Honky Tonk Woman) roared overhead which was unusual because a) there's no Virgin service from Glasgow in February b) it was 4pm so too late for usual service c) it was one of the new(er) A330-2s
I checked it out on Flightradar later and it headed up to Inverness, turned around and landed back at Glasgow. It was indeed a training flight. It then re positioned down to Heathrow to operate the Heathrow to Miami flight today.
I have heard that it's a special charter, not a training flight thus the first revenue flight of the A332.