Bill Browder, the human rights campaigner, has alleged Kremlin interference in British politics across all parties

Downing Street is suspected of suppressing a parliamentary report into Russian interference because it contains “embarrassing” disclosures about the Kremlin links of wealthy Russian donors to the Conservative Party, sources have told The Times.

The report examines the extent of links between London-based Russian oligarchs and the Federal Security Service (FSB), Moscow’s secret service, according to a source familiar with the intelligence and security committee’s work.

The names of the oligarchs have been redacted but “what makes it interesting is just how close some of these people are to the FSB are or have been”, the source said.

The contents of the cross-party committee’s report are “embarrassing” rather than explosive, sources said, leaving some baffled as to why the government allowed intrigue to grow