It's a Loglogic Softrak machine with possibly with a front PTO - see http://www.softrak-atv.com/ I think I recall seeing a shaft when I saw this working from a distance a couple of years ago, but then again, that does look like hydraulics... I used to work at the RSPB Nature Reserve in Lochwinnoch on the other side of Scotland and they got a company called Cloverleaf Groundcare in for a few years in the late 90s/early 00s to cut reeds and sedge using a Softrak and fingerbar mower, see photos below.