I received a curious letter from HM Revenue and Customs. Apparently, they are changing the way they are going to collect Class 2 National Insurance. Before, when registering as self-employed, people automatically received a bill in the mail regardless if they were liable or not. And they had to apply for Small Earnings Exception certificate or ask for money back, if they knew how much they have overpaid and so on. Now, it seems, Class 2 is going to be calculated automatically by a computer, along with other taxies, when you submit your Self Assessment return, once a year. Which makes sense. It is only a couple of additional lines of programming code in the online software people use for Self Assessment on government’s website. Given the current what already became a long-term economic crises, they were probably paying more in people's salaries for processing Small Earnings Exception certificate applications than collecting in those taxes anyway.
I didn't find anything to verify this on an official government’s website, but I found more info here: http://www.tax.org.uk/tax-policy/newsdesk/2015/class_2_NIC_reform_changes