Is scalextric the bestselling slot car racing game?

Answer 1

In a way, yes as home sets. They were-are made in the United Kingdom. The Scalextric cars were unusual as they had much use of plastic in the chassis as well as the bodies, and had what amounted to Flexible frames- which posed hazards of its own. It is interesting to see some collector interest in the seemingly moribund hobby-sport of slot racing.