Transparency of Lobbying, Non-Party Campaigning and Trade Union Administration Bill

One wonders what thought is driving the Government to ask trade unions to do what the Bill requires. I cannot for one moment see a situation where the Government would ask for the same accuracy in electoral lists held by returning officers in particular areas at any given time. It would be almost impossible to provide. The amount of bureaucracy and administration required to keep such lists up to date would be beyond the financial capability of most local authorities.