The FA Cup semi-finals commence today with Manchester City locking horns with Premier League rivals Chelsea at Wembley. Their showdown takes place 24 hours before Coventry and Manchester United face off, with all four teams dreaming of glory in English football’s oldest competition. Every year, however, fans bemoan the fact the semi-finals are held at Wembley. The home of the national team is sacred and, previously, was just used for the final. Some think that’s exactly how it should be. It hasn’t always been the case. As recently as 2007, neutral grounds were being used. But ever since then W…