Definitely a jet. I've rung the airport a couple of times but haven't been able to get much help there. I'll persist and will get the answer from there or the local military airfield. It will be interesting to know what the damn thing was.
The only visible propellors on the plane were on the front of the pod at the end of each wing.
The plane was seriously big - at least 747 in size.
You wouldn't think such a large and visible thing would be a mystery, but there it is.