One of the ways in which a club (I don't know which) used to get round the salary cap is that they had a club pool of Range Rovers, these were technically for anyone to use and therefore didn't convey a benefit on any individual - however only certain people had the keys to each of them.
I know a couple of people who have worked on the salary cap audit and they've acknowledged that it's incredibly difficult to value or even identify all the little extras that players receive - for example squad trip to Dubai where there's no training involved - should this be within the salary cap?