When was the law on double-banking in lineouts introduced in the U.K.

http://groups.google.com/groups?q=+%22double+banking%22&hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=1HHh5.126%24hP6.11133%40newshog.newsread.com&rnum=3

   >"Double banking" was a lineout technique which involved teams
   >playing two rows of their own players at the lineout. This was a
   >common ploy until the Welsh team became masters at it. As usual,
the
   >International Rugby Board did not like to see Welsh superiority in
   >any area of play and changed the rules so as to make it "illegal".

Maybe this will mean something to somebody who knows something about
rugby.

czh