I remember watching the teams coming from the south of Plaza de España... so maybe after U-Turn board? just before pitstop?
Can't remember if we saw the teams reading the clue or if it was a voice over like the Pitstop clue in Orvieto
Just checked and Dave & Connor, open the clue after U-Turn board, cut to Phil talking about Plaza de España cut to Dave&Connor leaving the U-Turn board with a voice over from Dave saying "Plaza de España", his lips on-screen are open but they are not saying it.