Lay up and redeployment of SBST Dennis Darts

Let's discuss on something that these buses which will leave us by next year.

SBS8009A (BNDEP SP/42)
SBS8015G (BNDEP SP/42)
SBS8016D (BNDEP 42)
SBS8018Z (BNDEP 42)

What happened to the rest???

http://buses.sgforums.com/forums/1279/topics/386652