Did Calder already stop the invasion at Finisterre?

Was Calder the admiral who saved Britain by winning at Cape Finisterre?

Calder may have stopped the immediate plan, but Trafalgar made the result certain by destroying the fleet's practical ability to try again.

Calder's victory at Cape Finisterre can be read as the action that frustrated the invasion, and Napoleon treated it as a serious lost opportunity. That judgment still depended on what Villeneuve did afterwards. Had his fleet stayed in Cadiz for the rest of the war, Calder's success would have looked conclusive. Trafalgar removed the uncertainty by settling the threat that the surviving allied fleet still posed.