I thought that I would share this bit of information with you all.
Recently bought the Samsung HT-DS110 Home Cinema setup from Currys as part of a package with the 43" Samsung Rear Projection TV.
The region hack for the HT-DM150 worked on my HT-DS110. One small point is that the disc drive does NOT eject, instead the unit says "goodbye" and switches itself into Standby.
Our unit was originally a Region 2 system. Successfully tested with R1 and R4 discs.