[AdrianNorman]

The history of Sport World is interesting. 
After its release, Scalextric ran a worldwide championship competition with early adopters. It worked very well and was perhaps ahead of its time. This was borne out of the fact that the three extra modules were there for 8 lane racing and digital racing. However, during the development to get the digital functionality working properly within Sport World, time ran out as there was no clear time frame as to when the problems with the digital functions vs. time lag could be resolved - and SportWorld had to be launched as an analogue unit only. SportDigital was released a year or so later as we know it today - that is, without it being part of a grander SportWorld master powerbase with analogue and digital functionality!
Considering it was twenty years ago when development first started it is probably fair to say that it was too advanced for the available telecoms infrastructure. Today with much faster internet connections, it could have worked. Perhaps!
A great product and its legacy lead Scalextric to release Digital to the world. So there's a positive to it all and its still a great little product as a standalone powerbase.

I hope this is of interest.

Happy Racing
Adrian