On #2, we have a traffic separation zone coastal shipping traffic is required to follow between the Channel Islands and the southern ports. South of the islands, they can go wherever they want, but with there not being a required traffic scheme into the 2nd largest port in the country, ships come from all directions into a narrow "funnel" as they all head into the ports. The Marine Exchange and Coast Guard are not amused.
On #3, the Navy is not amused either. Yes, the test range is a warning area (actually areas, as there are several whiskeys from the deck to unlimited), so no, they can't force traffic out, but besides notices to mariners, aircraft are deployed pre-exercise to try and warn out small boat traffic so they don't meet a missile flying at 20' off the deck. Big ships, especially international ships, often ignore the warnings, and because of the fuel switching engine problems, in a couple of cases, have been unable to comply in a quick enough time not to hold up or stop an exercise. The traffic in the range has increased from a few ships a day to dozens. Hence exercises have been postponed or canceled at a significant cost to the taxpayers.