It's in the genes...

The sprog has become really interested in electronics and how circuits work. Obviously this is something I want to foster - I had an electronics kit when I was young and it set me up for a lifetime of happy soldering and fixing. Plus, post apocalyptic skills FTW. He is, however, only 4. Albeit a smart 4. I had my on on this:

http://www.amazon.co.uk/Logiblocs-Electric-City/dp/B001IY7THO/ref=sr_1_6?ie=UTF8&qid=1321524246&sr=8-6

Anyone have any better ideas?