six extra officers drafted in by the British Transport Police this season . derby Manchester United , bury and bury will all be in London . United face Chelsea and Leeds travel to derby Athletic on loan . Liverpool face Aston Villa in the FA cup semi - final at Wembley Stadium .
400 extra officers drafted in by the British Transport Police this weekend . Rivals Manchester United , Liverpool and Leeds will all be in London . United face Chelsea and Leeds travel to Charlton Athletic on Saturday . Liverpool face Aston Villa in the FA Cup semi-final at Wembley Stadium .