The number of suppression requests made to the Fundraising Preference Service more than halved in its second year of operation, according to the Fundraising Regulator's annual impact report.
The FPS, which was launched in 2017 and allows people to block unwanted contact from specific charities by phone, email, text message and post, received 8,719 suppression requests in the year the end of August 2019, according to figures released today, down from 19,583 in its first year of operation.
The service was used by 2,820 people in the most recent year, meaning that on average users were blocking contact from three charities each.
The regulator confirmed that it would next year carry out a review of the service, which was introduced after the fundraising scandals of 2015.
The number of complaints about charity fundraising dealt with by the regulator fell by almost a third this year, down by 32 per cent from 1,080 to 737 this year.
But the number of charities registered with the regulator grew by 20 per cent, from 3,000 to 3,597, and its income from the voluntary levy paid by charities that spend more than £100,000 a year on fundraising increased to £2.2m this year, up from £1.9m last year, and it spent £2m.
It also completed 82 investigations into fundraising organisations this year, and carried out the most comprehensive review of the Code of Fundraising Practice in a decade, which resulted in a more accessible version of the code.
The regulator also reiterated plans to next year review the effectiveness of the use of the Fundraising Regulator's logo on fundraising materials.
Speaking at an event to launch the report on Monday, Lord Toby Harris, chair of the Fundraising Regulator, is expected to say: "Since I became chair in January 2019, I have seen record numbers of charities paying the levy and organisations registering with us.
"This clear demonstration of support from fundraising organisations shows the appetite for voluntary regulation from across the sector.
"Charities have made excellent progress since 2016 and are working hard to build public trust and confidence in their fundraising activities."