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Hi Rob,
If it were a satellite, given the time of night, it would have to be in a very high orbit.
Geo-synchronous satellites are parked in high orbits and can be visible at that time
of night. Some spin and alternately brighten and dim. However, the belt in which
geo-stationary satellites are parked would be a few degrees south of this image
at your latitude at Duckadang and in any case, they would show an apparent
East-West movement which clearly the object in your image does not obey.
Alternatively, it could be an object such as a spent booster in a high orbit.
I haven't done a search to help ascertain it.
The aeroplane hypothesis, though the least exciting, is the most likely.
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