'Warning before mankading has gone on for decades'
It may happen now and again but there are players who play in the ECB Premier leagues that are known for it.
One bowler in particular in the South Wales Premier league is well known for it.
I umpire in the local leagues, i've never had it happen, if it did and the captain wanted to withdraw the appeal i would refuse the request and give the player out. It's gaining an unfair advantage.
As from next Saturday, it comes under Law 38 - Run Out, so there wont be any discussion about it.