The "repulsive" crucifixion of a Saudi national, who was among 37 men executed in one day, has been condemned by a Foreign Office minister.
Sir Alan Duncan told MPs it "is a deeply backward step" by the Saudi government, in response to an urgent question from Liberal Democrat leader Sir Vince Cable asking what representations the Government has made to the Saudis about the executions.
Saudi Arabia executed 37 Saudi nationals for " terrorism -related crimes", according to the country's interior ministry.
State-run media carried statements on Tuesday to say those executed had "adopted extremist ideologies and formed terrorist cells with the aim of spreading chaos and provoking sectarian strife".
Shadow foreign minister Fabian Hamilton said the Saudi regime "appears to care very little about international law".
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He added: "Publicly pinning one of the heads to a pole as a warning is not only disturbingly barbaric and medieval in nature, but it is also an abhorrent violation of human rights."
Sir Alan responded: "All here would want to defend human rights and abhor executions of this sort. We really do genuinely disapprove in the strongest possible terms what has happened, particularly when it was reported that one of them was displayed on a cross, something that anyone here just a few days after Easter would find more repulsive."
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Earlier, Sir Vince said three of those executed were juveniles and "possibly more".
He added: "Does he (Sir Alan) not accept that Britain's moral position on this is somewhat compromised by the continued supply of arms fuelling atrocities in the civil war in Yemen and that we are in urgent need of a reappraisal of our relationship with Saudi Arabia given the fact that the continued medieval barbarism of this regime does not constitute the basis for a friendly alliance and, indeed, makes it an enemy of our values and our human rights."
