The impossible job? The pressure of refereeing Scotland's title decider

Don Robertson has taken charge of six Celtic games this season, and four for Hearts

In a league routinely dominated by Celtic and Rangers, every contentious decision comes with its own subplot of supposed bias and intrigue.

Which referee has, allegedly, been pigeonholed as a Celtic man? And who supposedly has a track record of being sympathetic to Rangers?

"There's always been this narrative surrounding Scottish football and referees," BBC Sport football expert and former Celtic forward Chris Sutton said.

"Whose side are the referees are on? That's the way it's viewed among both fan bases.

"There's always there's been conspiracy theories doing the rounds."

After Celtic's controversial win over Motherwell on Wednesday, match referee John Beaton and his family were put under police surveillance following a leak of their personal details online.

"This is the inevitable consequence of the heightening criticism, intolerance and scapegoating demonstrated this season by media pundits, supporters, official supporters' groups, clubs, players, managers and former match officials," the Scottish FA said., external

"Those who have sought to apportion blame and conspiracy towards match officials to deflect from defeats or perceived injustices throughout the season have contributed to an environment that puts the safety of our staff and match officials in jeopardy.

"The Scottish FA condemns in the strongest possible terms attempts to compromise the safety of match officials."

On Saturday, Celtic meet Hearts a first-in-a-generation final game of the season to determine the Scottish Premiership champions.

It will be once again incredibly high stakes and, for the officials, extreme pressure.

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How controversial VAR calls have defined two title battles

The rumour and speculation of supporters was tested to its limits on Wednesday when Celtic were given a hugely controversial and crucial stoppage-time penalty at Motherwell, given after a video assistant referee (VAR) review.

The VAR, Andrew Dallas, had sent referee Beaton to the pitchside monitor for handball against Sam Nicholson.

Kelechi Iheanacho despatched the spot-kick, giving Celtic a 3-2 win and changing the complexion of the final day of the season.

Any victory would now give Celtic the title. Without the VAR penalty at Fir Park, Martin O'Neill's men would have needed to win by at least three goals.

Hearts boss Derek McInnes called the penalty given to Celtic "disgusting", and has suggested they are not getting their fair share of decisions.

"We're up against it, we're up against everybody," McInnes said.

In the aftermath, social media was full of doctored images trying to prove either that the referee had got the decision wrong or made a mistake.

Later, Hearts' owner The Foundation of Hearts issued a statement, external saying that it was "extremely concerned by a number of refereeing and VAR decisions" in recent weeks.

It added that it was calling on "those responsible for the officiating of Saturday's match to ensure that the highest standards of decision-making are applied".

Then, on Friday afternoon, the Scottish FA's revealed Beaton and his family had needed police protection.