They are spendy, but I can attest to the quality https://www.canvasback.com/
I actually reused a set I had from the cargo area in an Outback in both a Wrangler Unlimited and our Sportwagen. It's way too big for the GTI, but may try to use it anyway. Waterproof, washes off nicely with a hose or at the self-serve car wash.
wow - they are basically same as the UK ones. thanks! I may end up getting this from canvasback.
Traded in my Jeep and I just got my R this past Saturday. My TDI will be going back in another month so I need some kind of seat protector/hatch area cover for when I take my 2 boys (shetland sheepdogs) to the beach, etc. As the R will be my only vehicle now (who needs anything else right?)
In regards to seat covers: does anyone use front seat covers? My dogs like to do that fast, incessant scratch thing where they sit I guess to get comfortable.