In the U.K. a lot of people do not have much interaction with HMRC (the tax authority) beyond knowing their National Insurance number, knowing their tax code, and seeing tax deductions on their payslips.

https://www.gov.uk/income-tax/how-you-pay-income-tax

Even when they do, it can be done online, or by post, or by phone.

Anecdote: I rang HMRC and within 60 minutes all of my questions were answered.