Regarding Team 17's lost Jaguar games:
Thanks to an old Team 17 'Team Talk' archive i discovered that:
Team 17 stopped all Jaguar work by Sept'95 as the user base was far too small to make it finacially feasable to support.
Allegiance:Was Never really started on Jaguar, everything was done on PC, until Team 17 realised there was'nt much of a game to start with.
Rollcage:Appeared to be PC Only at 1 point and in Team 17's own words was'nt a great original loss to see canned, as it was basically a Sega Rally clone.
And Witchwood:Canned early on in development (i assume PC was leading version, PS1, Saturn+Jag conversions planned to follow?) as Team 17 were'nt even sure there was a PC market to support it/asked themselves how many PC owners would buy it.