About 10 years ago I was happy with 12°C when I used to work outdoors. Cold enough to work hard without working up a major sweat.
Nowadays, given how it is constantly humid as balls here now, I lean towards 10°C being a similarly comfortable temperature, even 8°C depending on what I’m doing
I passed in 2007 with a VW Polo ❤️
At the moment, my learners are passing in a 2015 VW Scirocco 😎