They ask if you have a licence with a Yes / No choice. They don't ask for the licence number, which I'd be surprised if anyone in these islands could recall. Rather charmingly, they assume you will be honest in your answer.
Why is it that I find on certain websites (this one included) that some keystrokes aren't recognised when I use Safari? The letter 'e' not being recognised is common. Chrome works fine. This is on a Mac with Catalina and a British keyboard.