My neighbour just got one of these, looks pretty good for the price. I'm not a huge Tesco fan, so I've been looking around - but can't see anything comparable for this price. Not sure if it's available offline, neighbour said she did a reserve & collect thing.
from the website:
This handy lithium Ion 3.6V shears and shrubbers set is ideal for shaping your shubs and small hedges, and offers simple yet accurate edging to your lawn by changing the blade with just the push of a button. It is cordless and uses lithium-ion battery technology for long life and cable free trimming. It has a 5 position handle and a charge time of 3-5 hours.