Public transport doesn't work in many parts of the country, and can't due to density, but for long distance travel the train (assuming there's capacity, and there isn't) is great, you could drive your car to a station, park, get the train to your destination (say Inverness), then pick up a hire car at the far end.
The problem is
1) No hire car facilities at stations at any time, let alone open when trains arrive
2) Parking costs a fortune, not because of supply and demand, but because of profit extraction -- the Council car park next to the Railway one at Crewe is £3 rather than £12 a day.
If you wanted to travel from somewhere a couple of miles out of Marshfield near Bristol to somehwere on the coast near St Andrews in Scotland, it's a 440 mile journey, which runs into charging issues, but neither has stations, and you'll likely want to pootle around at each end.
If instead you drove to Bristol Parkway, took a train to Haymarket / Waverley and could then get in a guaranteed charged car for pootling around Fife, that would be great. Instead what's more likely is someone will simply drive the entire way to have a car available at the far end, which mainly means
Electric vehicles can work in tandem with public transport, walking and cycling as part of an integrated transport solution if they (and cycles) are available to rent near stations, the costs work out, and the capacity is there.