What is your favourite referee whistle? How do you pick your whistles? And what makes a whistle good? I like whistles with a sound other referees don’t have. The Fox 40 Pearl has that in The Netherlands. That reminds of a situation during last season. I officiated with a blue Pearl version of the Fox 40 – matching with my blue referee kit ofcourse. Usually people ask me afterwards something about a situation or just say thanks for refereeing. But a man stepped forward and began talking about that unique sound of the whistle. Yeah, it was a colleague who was off duty that weekend. I’m wondering if he found…