Speaking of dual reg, interesting news out of Sarries:
http://www.planetrugby.com/story/0,25883,3823_9391973,00.html
Sheriff on a season loan to Bedford.
Scott Spurling, Matt Hankin, Nathan Earle, Hayden Thompson-Stringer, Nick Tompkins, Aaron Morris and, big call, Maro Itoje all dual registered there as well.
Obviously dual registration still means players can and do play plenty of games for their 'parent' club, as I believe Farrell did when dual registered with Bedford at the start of his career. Maybe a bit surprised to see Itoje, Earle and Tomkins there though.