This is in the Strand branch marked down from £399. I don't know if there are any other branches with this as it appears to be a clearance item. The SC-BT100 is the one that you can add wireless rear speakers to.
* Enjoy All Audio Codec for Blu-Ray Disc: Dolby TrueHD, Dolby Digital Plus, DTS-HD Master Audio
* Powerful "Kelton Subwoofer" & Clear Sound "Bamboo Diaphragm Front & Center Speakers"
* Full-HD 1080/24p Playback, HDMI, P4HD Accurate 1080i to 1080p Conversion
* Final Standard Profile for Picture-In-Picture Function
* Enjoy Additional Inter-Operability with Panasonic Products which have VIERA Link
* Enjoy Precious Memories in HD with SD Memory Card Slot