Not designed and produced at the factory level.
I seem to remember that "The L59A1 DP Rifle. By Peter Laidler." stating that the L59A1 was the last rifle produced at Enfield and should be a part of any Enfield collection.
Was he playing loose with the production facts?? The one I have has no sign of previous markings on the socket or any place else. If it was scrubbed, they did a good job of it.