For those who wish to consider buying a car, rather than leasing, I find that Drivethedeal is very useful. Their prices are U.K. main dealer factory ordered cars to your exact spec (not in stock cars). Discounts can be as high as 25% (including ICE cars and premium brands) although most are in the 10-15% range. Some of the prices will include manufacturer incentives, such as PCP offers, but you can pay those off with no penalty after a month (as I have done a few times). I have used their prices to get local main dealers to match them (or come very close).
Of course, if you want the very best deals, buy a car that’s a few years old, where someone else has taken the depreciation hit.