Head of referees has say on major incidents in title raceScottish football head of referees Willie Collum has backed the controversial decision to award Celtic a stoppage-time penalty against Motherwell on the penultimate day of the Premiership season.Collum believes that the VAR team were right to flag a handball by Motherwell’s Sam Nicholson to referee John Beaton and that the player’s arm was in an “unnatural” position.However, Collum admitted that Hearts should have been given a penalty kick when Alexandros Kyziridis was tripped by Tamanda Maswanhise during their 1-1 draw with Motherwell on May 9.Referee John Beaton gave Celtic a late penalty against Motherwell after a VAR review…