Given the economics of connecting services, all mainline stations should have a good sized car park to enable park and ride, combining rail for the journey to London (or another city) where train is best and car for the station to home where it likely is, attracting more customers to increase revenue and pay for the railway requires a service which meets the customers needs.
Though at many stations, particularly tube stations in outer London where it was somewhat controversial, a 2/3 level carpark with flats above could combine both.