Wayne Smith is among the favourites to become England's next coach © Getty Images

Kiwi coaches are currently the most coveted in world rugby and the New Zealand Rugby Union should be wary of clipping their wings, according to the New Zealand Herald's Gregor Paul.

If they could, the New Zealand Rugby Union wouldn't mind reverting to the bad old days and reintroducing the so-called 'Graham Henry' clause. Back in 1998, after Henry famously announced he was heading to coach Wales (and going that night), the NZRU decreed that anyone who coached a foreign national side could never hold the All Black job. They reneged on that petulant stance a few years later but protecting their best coaching capital has again become a pressing issue. The World Cup was a potent demonstration of the power and influence New Zealand coaches hold across the globe.