For the first 6 months I owned my car last year, it was not displaying a front numberplate, and had 5% tint all round...didn't get looked at twice by cops, even when I was parked suspiciously in Russell Offices carpark after midnight on my phone, and they pulled up and asked wtf I was doing.
Admittedly I don't drive like a hoon, unless there's traffic (see: incompetent f**kwits driving like retards) and I want to get the fk away from them...
Ah well, who knows lol