On Leach, we were all partially wrong - he's interviewed in the Telegraph today. Never called in a game, but there was a genuine problem with his action.
On Kerrigan...suspect he was a bit of a one season wonder in first class cricket - he did very well the year Lancashire won the title, but perhaps people failed to take into account the benefits he derived from playing nine games at Southport on a raging bunsen. Once batsmen went up in class, or had seen him before, his lack of pace through the air made him quite easy to get after.