Looks like AKAI are bringing to the table a lite version of their purpose built Ableton Live APC40 MIDI controller for which they've halved its numbering for the slightly smaller APC20. From what I can gather they've taken out a bunch of rotary controls in order to achieve its cropped and slightly leaner form factor for all the control elements to remain exactly the same size. After a price check of all the main UK DJ equipment suppliers (including HTFR and Westend DJ's) there doesn't seem to be anyone willing to budge from the 169.99GBP mark. You'll find it here for one whole pound sterling less with free delivery included. Akai APC20 COMPACT PROFESSIONAL ABLETON CONTROLLER.

The official blurb reads like this:

Designed in partnership with Ableton, mapped for Live, and fully customizable
Clip Launch matrix with multicolor lighting displays current clip status
No mapping required; every button and fader is pre-mapped
Bidirectional hardware/software communication for visual feedback on APC20
Solid, professional feel with rugged, metal chassis and premium controls
Comes with Ableton Live Akai Professional APC Edition software
Works with standalone editions of Ableton Live
USB plug-and-play connection for Mac and PC

APC20 Ableton performance controller

USB cable

Power supply

Software CD

Quick start guide
Power Supply:  DV 12V 2.0A pin-positive, auto-switching (100-240V, 50-60Hz) 
Communication:  USB-MIDI with proprietary hardware/software handshake 
Inputs:  USB 
Weight:  3.8 lbs 
Dimensions:  29.5cm x 33.3cm x 5.7cm (WxDxH)
11.61" x 13.11" x 2.24"
(measured to the highest point, which is the CUE knob) 

Mac: G4 / Intel recommended, OS X 10.3.9 / 10.4+ recommended
PC: 1.5GHz, Windows XP or Vista, Windows-compatible sound card / ASIO driver support recommended
512MB RAM / 1GB recommended, QuickTime 6.5 or higher, DVD-ROM drive, USB port