By Simon Mullock Bernardo Silva is fast becoming Manchester City’s go-to guy on the big Champions League nights. The non-stop Portuguese midfielder came up with another vital goal as Pep Guardiola’s European champions took a giant step towards the quarter-finals with an accomplished first-leg performance against the slayers of Manchester United. Silva’s last eight goals in the competition have all come in the knock-out stages – and it’s crazy to think that City would have sold a player who truly embodies Guardiola’s philosophy if Barcelona had come up with the cash a couple of years ago. The …