Set Scrum

Dear ref

during a set scrum is one of the locks allowed to slip his binding  of his second row partner and drop his shoulder  allowing him to reach into the scrum as a wyn-jones did last week

Martin 

HI Martin

The Rugby Ref didn't see the incident you were referring to, but locks must maintain a continuous bind with each other and with the front row for the length of the scrum. Handling the ball in the scrum (if that's what happened) is also illegal.

20.3(f) Binding by all other players. All players in a scrum, other than front-row players, must bind on a lock’s body with at least one arm prior to the scrum engagement. The locks must bind with the props in front of them. No other player other than a prop may hold an opponent.  Sanction: Penalty kick

20.9(b) All players: Handling in the scrum. Players must not handle the ball in the scrum or pick it up with their legs.  Sanction: Penalty kick

Thanks
The Rugby Ref