Steve, yes, I beleive they can drive through the line out - in England any way. Here's an extract from the U9/10 Continuum - you can find this on the RFU site. "The line out begins when the ball leaves the hands of the player throwing it in. The line out ends when the ball or player carrying it leaves the line out. This includes the following: * (1) when the ball is thrown or knocked out of the line out; * (2) when a line out player hands the ball to a player who is peeling close to and parallel to the line - Note: "peeling" occurs when a player leaves the line out (after the ball has been thrown in) to catch the ball knocked or passed back by a team mate; * (3) when a ruck or maul develops in a line out and both feet of all the players in the ruck or maul move beyond the line of touch; and * (4) the ball has been passed or carried out of the line out or if the catcher decides to drive through the line out."