I had my RC coated, also from Lexus Swindon. On the occasions I've been back I have also spotted an independent detailer there treating cars.
I am very impressed with the coating, very, very easy to rinse off general road crud, especially over the winter months.
I am also somewhat OCD about keeping the car clean, much to the amusement of my neighbours ....
Now almost at my 1st anniversary, the coating still performs as below. Should it change, we have a lifetime warranty, so it would be retreated FOC. Win, win