I've just ordered these; seems good value considering others are selling for £75.
Wireless Range: Up to 50m indoors, 300m outdoors
Last Number Redial: Yes
Handset Quantity: 4
Model Number: KX-TGC224EB
Answer Machine: Yes
Message Playback: Yes
Polyphonic Ringtones: 15
Directory: 50 names and number
Talk Time: Up to 16 Hours
Voicemail Recording Time: Up to 18 mins
Best of all, this set [with caller id from bt] had Nuisance Call Blocker, just brilliant feature!