By Scott Trotter Boos were heard at full time at Old Trafford after Manchester United allowed Burnley to come back and earn a draw. Erik ten Hag and his stars will know exactly what the home crowd thought of their result as discontent was fired in their direction after the club were left unable to put away their relegation-threatened rivals. United had led through Antony but Andre Onana’s costly foul allowed Zeki Amdouni to score from the penalty spot late on. The draw sees United’s season continue to stutter in search of European football but they remain sixth. Newcastle’s win over Sheffield …