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Thanks John,

I haven't played with ExifTool but I should have some time in the next week.
My guess would be that it doesn't like the time and date string, you can try enabling 'Save time zone' in the settings to see if this makes any difference. Be warned that this can cause problems with other software though.

Update
It was the GPX time and date, enabling the 'Save time zone' works using ExifTool 9.90 on Windows 7:
exiftool -geotag test.gpx test.jpg