Arsenal took another big step towards ending a five-year exile from the Champions League as Bukayo Saka’s strike beat Aston Villa 1-0 to open up a four-point lead in fourth in the Premier League. The Gunners could even increase that gap with a game in hand over fifth-placed Manchester United and were well worthy of the three points against a toothless Villa despite the narrow scoreline. Arsenal boss Mikel Arteta had complained about the tight turnaround his side faced after Wednesday’s 2-0 home defeat to Liverpool. That defeat ended a five-game winning run and there was no sign of tiredness fr…