In 1973, in a Vauxhall Viva, in Hayes Middlesex, took a chance at an awkward junction. Turning right on a hill with a string of vehicles. Went for a gap and thought I had blown it. Fortunately passed. I too was very polite and told him I was a poor civil servant who needed transport to get to work.
After I passed, I paid for some more lessons for the instructor on driving rather than just for passing the test.
I followed up a couple of years later on the council run skid pan at Greenford.
Best hour of instruction I had.