I believe they were only responsible for wipeout 3.
We'll never know for sure, but I've always thought that the success of the franchise really stemmed from their influence at the beginning.
The packaging and manual alone still feel fresh after almost 30 years IMHO:
https://www.mobygames.com/game/wipeout/cover-art/gameCoverId...
You can see the little "I love my DR" logo on the back cover:
https://www.mobygames.com/game/wipeout/cover-art/gameCoverId...
https://www.mobygames.com/game/wipeout/cover-art/gameCoverId...
It truly felt like "an experience from the future" back in 1995 - and to some extent still does, for this fan at least :)
This fan as well. Really fantastic, innovative stuff.