Brainbox manufacture a great range of electronic kits with a cool easy to use press-stud system for making the contacts. Kind of like the kits around when I was a kid but much easier to use and no pesky wire to lose or stab yourself with.

As with all Brainbox kits there is no soldering or trimming required
The kit uses simple brightly coloured components with press-stud connectors.
Requires: 2 AA batteries (not included)
Build over 180 exciting experiments
Suitable for ages 8 & up