(1) Be a more visible leader of safety initiatives. It's important that employees see you as the action person who does not let safety issues go unanswered. Your response to issues helps build trust in the process and the overall efforts put forth by the safety department. (2) React quickly to safety issues / concerns that are raised. You don't want to be considered a black hole when it comes to safety. Employees that raise concerns want answers.
Yes they do. Any circular saw should have the size right on the saw some where. Standard is 7 1/4  NOT 7 1/2 For wood cutting blades 7 is standard for concrete (Masonry) or metal cutting blades. I guess you are in the UK or somewhere then. The 165 mm is equivalent to a 6 1/2  saw in the states. That would be the standard size for a cordless battery operated circular saw here.
Circular saws make quick, straight cuts across a board (crosscuts) or along the board's length (rip cuts). You can also set a circular saw to make bevel cuts. Circular saw sizes are usually classified by the diameter of their blades. Sizes of 5-1/2 to 7-1/4 inches are the most common. There are also many options available on circular saws. Choose your saw based on your specific needs.