Not much help, but I had the same problem with the groundsheet for my Motordome Tourer.
As it happens I originally ordered the wrong groundsheet as the 'Freelander' groundsheet was listed as a 'recommended extra' for the Motordome Tourer on the shops website.
Fortunately the on-the-ball member of staff at
www.cave-crag.co.uk phoned me and suggested I amend the order so that I would receive the 'Motordome Tourer' groundsheet - which I duly did.
However, even when that arrived (and it did say Motordome Tourer on the groundsheet packaging) it did not fit.
I eventually bodged it together and it kept the place dry, even during quite heavy rain, but I am b*ggered if I can get the holes to line up properly with the awning no matter what I try.
Doh!