User blog comment:Jimlaad43/Ranking every Side-Competition in UK Robot Wars/@comment-25770073-20181215102055/@comment-4700688-20181217101507

German Robot Wars was filmed concurrently with UK Series 6, and let's be honest, the special was designed for the German series more than it was designed for the UK series. That doesn't explain how the European Championship ended up in the German series, but by filming date, UK vs Germany predated all of the other side competitions by a while.