This is already in action in london

Although not a legal precedent, large venues will now not confirm any event until this data is filled out for your event.
This info is passed on to the Met and the licensing commission.
If you don`t do it, the venues submitting to this "scheme" will not allow your event to go ahead.

I`ve already had to give my details to a few events because of this, and with my dealing with the law back when I was a very naughty london party organiser, you can bet I was spitting over this.