Not being a H&S killjoy, but I'm not sure flip flops are strictly the safest footwear to be wearing at the tip.
Watching a bloke and a woman carrying a rather large fridge freezer while both wearing shorts and flip flops had me cringing at the prospect of one of them dropping it. Along with...
Kick it off, throw it in, have a little scrimmage;
Keep it low, a splendid rush, bravo, win or die;
On the ball, City, never mind the danger; Steady on, now's your chance; Hurrah! We've scored a goal.
City!, City!, City!