NEW : The kings of Bahrain and UK are among the royals to attend the Bahrain lunch . NEW : Philip Luther greets each monarch on their arrival at Windsor Castle . But rights group Amnesty International said the event risked giving the impression that Britain did not care about the victims of human rights abuses . Campaigners say monarchs from countries with poor human rights records should not be invited . the Spanish Royal Household says Bahrain 's relationship with Bahrain means it can push for more reforms .
NEW : The kings of Bahrain and UK are among the royals to attend the Bahrain lunch . NEW : Philip Luther greets each monarch on their arrival at Windsor Castle . Campaigners say monarchs from countries with poor human rights records should not be invited . the Spanish Royal Household says Bahrain 's relationship with Bahrain means it can push for more reforms .