Wow, I’m amazed that some people would take delivery of a brand new car and use it for 3 years without buying some mats. I ask when ordering and even then only one dealer has ever thrown them in for free. They almost always say that they will be charged for unless the manufacturer includes them (which they very rarely do.) The Audi mats I bought were around £80 and the VW mats were £70. Sure you could cheap-out and buy some spurious ones online for twenty quid but I like to fit the proper OEM mats.
Motability should insist that dealers fit mats as surely worn & filthy carpets will impact on the price they achieve at auction once the lease is finished.