Sadly it's doesn't qualify for the ACU Trailbike Trials series because it's wheelbase is under 1350mm and fuel tank capacity is under 5 litres. I don't know what the seat length is but that's the other criteria for bikes in this series. Of course, there are plenty of long distance trials not in the series - it's up to the organisers to decide what class it's in.
Unfortunately, it seems the manufacturers of trail/longride bikes don't know what an LDT is - if only Gas Gas would make a trials-derived 2 stroke Pampera again! The Sherco X-ride is within the rules and a good bike but IMO it ain't no Pampera.