Assuming it's the same one I had a discussion with one of the Oban airport staff a couple of weeks ago (and it was a twenty-questions-guess-the-helicopter conversation while trying to arrange landing times... "it's like a Sioux and sounds like a girls name" he said....) its a Lama doing geophysical surveys around Oban, and has a large geophys boom system attached to it for the work, and was shipped in and assembled on site rather than being flown in.
Personally I though Sioux 'sounded' like a girls name and have never met a girl called Lama but am happy to be introduced.
h-r