For my recently ordered R, I got quotes from Carwow, Orangewheels and Drivethedeal. DTD best @ 12%, followed closely by OW. Got about 6 dealers contact through Carwow but discount varied greatly and most quite a way off the DTD offer, ordered last week via DTD and (following a recommendation from a forum member) requested a dealer fairly local to me, JCB Medway. They were happy to oblige, so order placed, painless

If you want to go to your local dealer, get broker quotes, take the best one along with you to wave in their face.