I stewarded at Sussex for four or fives years in the late 90s/early noughties. In this period, the quickest bowler I ever saw was a pre-injury Simon Jones playing for Glamorgan. He was just coming through, was early 20s, hadn't had any injuries yet, and was breathtakingly quick. Gave Michael Bevan an absolutely torrid time if I remember rightly.
Bevan didn't like the short stuff though