Great list!
So all these companies are linked:
Woodgate Aviation Ltd, Belfast
Woodgate Air Services (IOM) Ltd, IOM
Woodgate Air Maintenance Ltd, IOM *dissolved*
Woodgate Executive Air Charter UK Ltd, IOM *dissolved*
Manx Flyers Aero Group, IOM
Marham Investments Ltd, same address as above
Blue Sky Investments Ltd, IOM
Keen Leasing (IOM) Ltd
It seems that Marham Investments shutdown around 2006 and its aircraft transferred to either Blue Sky or Keen.