A new code of conduct is needed to ensure all Foreign Office staff tackle Britain's "inconsistent" response to human rights violations around the world, according to a Conservative policy group.

The party's human rights commission, which launched its second annual report on Monday, called for the appointment of a minister within the department with sole responsibility for international human rights.

It also proposed an "ambassador-at-large" to co-ordinate the work of embassies in promoting human rights.

Shadow foreign secretary William Hague was speaking at the launch of the report, which is published on 'international human rights day'.

It highlighted violations around the world including the use of rape as a weapon of war, the conscription of child soldiers, torture, slavery and religious persecution.

The report said: "While there are outstanding individuals at all levels within the FCO who demonstrate inspiring dedication and commitment to the promotion of human rights, the Conservative Party human rights commission believes that responsiveness to human rights violations around the world is inconsistent and too dependent on the calibre and attitude of individual diplomats.

"There is a need for clear policies to raise the profile of human rights promotion within the FCO, improve its capacity to address human rights issues, and standardise and synchronise conduct and policy."

The commission, set up in 2005, is chaired by MP Stephen Crabb.