The call follows the country’s admission that Jamal Khashoggi was killed in its consulate in Istanbul.
Events around the journalist’s death have caused a global backlash against Crown Prince Mohammed bin Salman.
Now the Royal Family has been drawn into the controversy over their ties.
They have received millions of pounds in jewellery from Saudi, and pictures of members of the House of Windsor alongside the House of Saud are seen as an “uncritical endorsement”.
Allan Hogarth, Amnesty International UK’s head of policy and government affairs, said the links must now be severed.
“The appalling killing of Jamal Khashoggi is a worldwide wakeup call over Saudi human rights for politicians, business people and, we would hope, for our own Royal Family.”
His views were echoed by Andrew Smith, of the Campaign Against Arms Trade. He said: “The relationship between both royal families is about influence.
It’s part of the political relationship which underpins arms sales. “But it has also done a huge amount to legitimise the corrupt Saudi regime on the world stage.”
In recent years there has been a crackdown on dissent in Saudi Arabia, with 100 executions in 2017 alone.
There has also been an intensification of the bombardment of Yemen, which the Crown Prince has overseen in his role as defence minister.
But the links go back many years. The Queen had been a close friend of the late King Abdullah, who died in 2015.
She received the Crown Prince during a three-day visit in March and together with Prince Andrew had lunch with him. Later, a dinner in his honour was given by Prince Charles and Prince William and, two days later, Andrew called on the Crown Prince at the Saudi Embassy.
During the visit both countries set out an ambition to build £65billion trade and investment ties.
It also resulted in a commitment to a £10billion deal for 48 Typhoon jets made by BAE Systems, which will secure thousands of jobs and was hailed by Defence Secretary Gavin Williamson as the “opening of a new chapter in our two countries’ historic relationship”.
That deal mirrored a similar one in 2014 after Charles took part in the sword dance at the Al-Janadriyah cultural festival sponsored by BAE Systems in Riyadh.
A day after he left, the multibillion Salem deal for 72 Typhoons was signed, although aides insisted the deal was not discussed. The Prince also flew to Saudi Arabia to pay his respects when Abdullah died in January 2015.
Meanwhile, Andrew’s connections have also drawn criticism and he was forced to step down as a special representative in 2011.
A royal spokesman said at the time: “Middle East potentates like meeting princes. He comes in as the son of the Queen and that opens doors. He can raise problems with a crown prince and we later discover that the difficulties have been overcome and the contract can be signed.”
The House of Saud has also been generous to our royals. Camilla, Duchess of Cornwall, was given three necklaces worth £3million; the Queen was given the King Faisal and King Khalid necklaces, now worth £1.2million, and Princess Diana was given the Crown Prince’s sapphire suite now said to be worth £1.6million.
A spokesman for Clarence House said: ” “All visits undertaken by the Prince of Wales to Saudi Arabia have been at the request of Her Majesty’s Government.”
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