For a new car, £200 a month for a brand new car for 3 years with 3 years servicing at 15k miles a year. If you're unlucky a couple of new tyres. If you are a heavy driver a new set of brakes for £500. £300 insurance and tax per year, total cost 8k, or 18p per mile. Maximum of 30p a mile total, or £22 return for my day out to Shrewsbury. An old car is clearly cheaper.
But for most people (outside of London), they need a car anyway so it's only the marginal costs that matter, and that's either £10 in the tank and £4 to park, vs £35 for a train that may turn up or may not, will take far longer, and you have to structure your day around.
For a longer trip, I drove to London during first lockdown, as the railway have cancelled the train I'd normally get. Hired a car, which was delviered and collected from home, for 3 days. Set off at 06:30, was in London for 09:30. Total cost of hire, petrol, and parking just off Euston road was less than a peak time single (which I need to arrive before 11:34), let alone a peak return (the peak is 15-19). That was for one person. To take my family to London costs £240 return, or £190 if I plan in advance and get a railcard. That's over 50p a mile, and that's the cheap "OFF PEAK" ticket.
To take my family in the car involves listening to the 65 story treehouse on audible instead of radio 4.
(That's of course the other issue - can't do that on the train)
will just find themselves carrying fresh air in their train or bus.
Any other industry would have to lay off thousands if they were carrying fresh air around -- see the airlines.
The railway doesn't seem to care. They've spend 30 years relying on daily commuters in the peak, business people doing peak time long distance for meetings, and maybe students traveling long distance off peak, and still required billions of tax payer subsidies. I don't think train tickets even attract VAT do they?
Those are all now at risk. Simultanously the £30b a year raised from petrol tax has an end in sight. What is the railway going to do? How will it continue to justify subsidies for mostly empty diesel trains rattling down the line from Crewe to Shrewsbury and on to Llandrindod when it doesn't even try to compete for custom from people who have a car?