Despite the failure of a number of UK aftermarket and tyre shows in recent years, three parties are now vying to take a share of what is a shrinking cake. Having cancelled its event this year, the Society of Motor Manufacturers and Traders is to revive its aftermarket show in 2004 by combining it with the highly successful, NEC-based CV (Commercial Vehicle) show, thus benefiting from economies of scale, writes Ian Wagstaff.