NEW : The kings of Bahrain and Swaziland are among the first to attend the Jubilee lunch . NEW : Queen Elizabeth II greets each monarch on their arrival at Windsor Castle . She say monarchs from countries with poor human rights record should not be honoured . Foreign Secretary says UK 's relationship with Bahrain means it can push for more reforms .
NEW : The kings of Bahrain and Swaziland are among the royals to attend the Jubilee lunch . NEW : Queen Elizabeth II greets each monarch on their arrival at Windsor Castle . Campaigners say monarchs from countries with poor human rights records should not be invited . Foreign Office says UK 's relationship with Bahrain means it can push for more reforms .