Tanks
The first video game I owned I assembled from a kit I bought from a company in Watford in the 1970s. It was a 2-player tank battle game and you had to solder the parts together before you could connect it to a TV set. It seemed pretty amazing at the time and a couple of colleagues asked me to build kits for them as well.
The company supplying the kits was run by some Indian guys operating out of a private house somewhere near the football stadium. I did wonder if they were the people that went on to create Watford Electronics.