Take the example of the Dutch robot Pullverizer:
Ruling champion of the last Dutch Robot Wars and thus automatically qualified for the Worldchampionships, did not qualify for Series 7 due to malfunctioning parts but ... what if he had qualified and had ended up in the top 3 of Series 7 ? Ah well...
Regardless of what happened during the filming and regardless of what I know (so no spoilers here !!!) I would do the sensible thing and decide for the top 3 of the English robots instead of the top 3 of Series 7 when choosing representatives to defend the English Colours. Its only logical !