Bosch Easytrim Cordless Trimmer / Strimmer - £16.49 (was £39.99) @ Argos !
Limited clearance stock.. but in stock @ my locals. Reserve & collect. Claims up to 8hrs usage for 3-5hrs charge. This DOES come with blades (thanks lomondview !).
Features : 14.4V battery | Battery recharge time 3-5 hours | Usage time up to 500mins | Plastic blade | Cutting width 23cm | Weight 1.9kg | Blades not included.