I spotted the Bosch ART 23 Easytrim Accu 14.4v cordless grass trimmer on the Tooled-up web site at £47.95.

This Bosch rechargeable strimmer uses a polymer blade rather than the more conventional line used by other strimmers. This polymer blade gives a 23cm cutting width. It is powered by a 14.4 volt 1500mAh rechargable battery.