The margin on brand new cars is tiny so whatever way you wrap it up there's very little by way of discount to be had regardless of what way your financing it. Being a cash buyer means nothing any more and is in fact a pain for most garages as they'll tend to get some sort of kickback on finance deals, have to count the money and lodge it etc.
If you buy a new car you'll pay fairly close to the RRP. PCP is perfect for those who understand it (and great for self employed people that do a lot of business-related driving) but it's as much a marketing gimmick for manufacturers to get people to change their cars every 2/3 years rather than every 5/6, which, is usually unnecessary for most people. If you're happy rolling over forever and throwing in a top-up deposit every now and then I don't really see the ownership issue as a major problem. It really depends on what you value.