The ridiculous system of "you have to tell us you've done nothing" seems endemic in the UK government.

Non-governmental, but the whole TV licensing thing is similarly annoying too. Lots of abusive threatening letters pushing you to declare that you don't watch live TV or use iPlayer, and if you do declare that, then they conveniently forget after 2 years anyway, and start harassing you anew :/

I'm don't think it's ridiculous - it's simply a positive acknowledgement you've seen the message, even if there's no action required. The alternative would be repeated reminders until some timeout. I would imagine that timeout might come with an enforcement order, even if you have nothing to declare.