The UK and US have sunk to new lows in a global index of corruption, amid a “worrying trend” of democratic institutions being eroded by political donations, cash for access and state targeting of campaigners and journalists.

Experts and businesspeople rated 182 countries based on their perception of corruption levels in the public sector to compile a league table that was bookended by Denmark at the top with the lowest levels of corruption and South Sudan at the bottom.

The Corruption Perceptions Index, organised by the campaign group Transparency International, identified an overall global deterioration, as 31 countries improved their score, while 50 declined.

In particular, the report identified backsliding in established democracies, warning that events during Donald Trump’s presidency and the revelations contained in the Epstein files could fuel further deterioration.