now to answer the question
Assuming you have the licence, type, and current on the aircraft, and the type does not require two crew, then I would say you may operate this aircraft for the company/owner and be paid for your duties.
You have a commercial licence with all the relevent endorsements.
This is NOT a commercial operation. As the requlations stand you do not require an AOC. You should have an operating / operations manual.
In a previous life this is exactly what I was employed to do, and employed as Pilot.
I had need to discuss with the UK CAA, a matter of FTL, as I was also flying UK AOC similar type, they suggested that I shut up, dont ask any questions, especially in writing...as they did not wish to address this situation.
glf