The DuDa used a British made Spondon frame. The bike was fast and handled well but had so many technical problems that Two Brothers Racing usually raced their modified F1. They won the championship on the F1b and then expected that they would receive some help/sponsorship from Ducati.
When that did not happen they started racing the Honda Hawk in the same series and developed a racing parts business for the Hawk.
I bought a bunch of Ducati F1 race take offs from their mechanic Dan Kyle back when I was restoring my F1b street-bike.
Dan now has his own business that does excellent suspension work:
http://www.kyleusa.com/I had him set up the Ohlins forks and shock on my Ducati Monster. He dyno's all of the Ohlins shock springs that he sells. I was amazed to see his setup that compresses the spring and then releases it, graphing the force verses length. He has found that more than 10% of the springs that Ohlins sends him are defective (not straight rate, or don't match the rate on the spring), and sends them back to Ohlins.
Ohlins sent the springs to a metal scrapper who was supposed to destroy them, but recognized them as motorcycle springs and put them for sale on ebay!