I'm thinking of buying a 2020 Defender HD10. One of the reasons I liked about the 2020 model was the parking brake, but the one the dealer showed me was a 2020 without one? Was it a later-in-the-model-year addition?
I'm not sure but there is an add on that the dealer will probably throw in with the deal, it works great I installed one in my 2019 and the part number if you need it is in the builds section.
If it’s like the hd8 XT mine has a small handle just below steering column. Push down on brake peddle and pull up on handle. Little handle keeps brakes applied.