According to 'Channel Register' UK's Inland Revenue have started sending out automated reminders asking for employers' annual returns for the financial year 2019/20 by 19th May or risk facing a £3,000 fine.
http://www.channelregister.co.uk/2005/04/19/inland_revenue_computers_back_to_future/
http://www.channelregister.co.uk/2005/04/19/inland_revenue_computers_back_to_future/