Letter from 19 organisations says a cap would help to protect democracy, weeks after £9m donation to Reform UK

Ministers should legislate to cap political donations to “rebuild voter confidence” in democracy, campaigners have said before the introduction of a landmark elections bill.

The government is being urged to show more ambition as it prepares to publish legislation early next year that will extend the franchise to 16- and 17-year-olds.

In a letter sent this week to Steve Reed, the communities secretary, and Samantha Dixon, the democracy minister, 19 civil organisations said “a donations cap is the best way to protect our democracy and to rebuild voter confidence in the system”.

Its signatories include the Electoral Reform Society, Transparency International UK, Hope not Hate and the UK Anti-Corruption Coalition.