British lawmakers are seeking aid cut to Pakistan unless there is proof the funds help stop extremism.
The international development committee report by the lawmakers singled out Pakistan for criticism.
The report was published just hours before Pakistan Prime Minister Nawaz Sharif was to meet British counterpart David Cameron in London.
According to Dawn News, Pakistan is the largest recipient of bilateral British aid, with Islamabad set to receive 446 million pounds of assistance this year.
The report said it was unlikely that expenditure would be so high if the country were not having to confront Islamic extremism.
The British lawmakers also said that aid should not be increased until Pakistani political leaders pay their fair share of tax, and increase tax collection generally.
According to the report, Sharif is set to discuss 'matters of mutual interest' with Cameron and other ministers during his three-day visit, as well as addressing an investment conference.
But Sharif's talks with Cameron are set to focus on the threat of extremism in Pakistan.