How do you buy a Tesla ?

Nissan (Swindon) gave us a 4 day test drive of a leaf - allowing us to not only test the car but get used to having an EV. whilst the car wasn't for us the EV life was and we're 100% sold.
We've had a nice TD in an I3, but of course want to look at a Model 3. Drove up to Cribbs in Bristol to take a look and although it was busy with lots of gawkers, We managed to get into the car and have a look ... at that point we looked for a sales person .... and looked ... and looked .. eventually noticed someone sat at the back, filling out some paperwork, who seemed totally disinterested with things going on around her.
Tried and failed to get her attention and in the end just gave up