Ghans,
In the mean time I have been asking around at Bristow Den Helder. No Bristow-helo arrived or departed by trailer at or from Den Helder Airport. So it must have been a helo staging through the Netherlands by road.
Was informed by Bristow you might have seen a sold EC155 on transport by road from Aberdeen to Luxemburg for further air-transport. My contact couldn't tell me which EC155 it was and what it's new owner is. Hope this will help.