I am a great fan of their "self watering" plant boxes at only £4 each, and have bought 6 more, plus the £25 coldframe which I hope will not just disintegrate. I use the boxes to grow salad leaves, watercress, little carrots, rocket, radishes and all sorts of other slightly delicate things that don't do well if the weather is dry. (Cue a spring of torrential rain).
The boxes are easy to protect from predators, and the water needs topping up only every week or so. One use I am about to put them to is weighing down tarpaulin that is trying to smother weeds.....
It's impossible to find these boxes anywhere else (unless very expensive), and Lidl has not stocked them for several years so I was pleased to see them there again at last.