Human rights groups and MPs are calling for an investigation into claims that MI5 officers colluded in the torture of British citizens detained in Pakistan during counter-terrorism operations, after the allegations were detailed by the Guardian yesterday.

The demand came as a fourth Briton alleged that British officials "outsourced" his torture to Pakistan's Inter-Services Intelligence agency in an attempt to extract information about a planned al-Qaida attack against the UK.

Measures designed to curb the power of major supermarkets and improve choice for consumers have been announced by the Competition Commission.

Judges are deciding whether human rights solicitor Aamer Anwar committed contempt of court, following a hearing at the High Court in Edinburgh.