Autocar Uk has this article about a young man owning a classic Minor to learn on.
https://www.autocar....year-old-morris
As the article says eeh insurace for him on a classic is way, way cheaper than the silly prices for a new car. The RAC estimates it costs £2,500 to learn to drive!
There are two disadvantges
1) you stil obvuoly need lessons
2) I don'tt hink you can takethe test in classic as it doesnt have head restriants which I think is illegal due to examiner H+S requirements
I learnt long, long ago when the roads were less crowded and fewer rules but I do agree that the ned to respect the poorer brakes etc on classic would help a learner -and yu can usually see out the back of them!