The Shell replacement plan, as of mid 2007, is here on slide 26 from this IHST presentation
http://www.ihst.org/Portals/54/Partn.../Sheffield.ppt
The 212 (and S-61) can carry on in service with Shell until 2011, while the 332 has 2 years more it seems.
Those time limits, if set in 2004/2005 seem unagressive if Shell really does believe that newer is safer and 'ALARP'.