Some of the country's largest charities can be somewhat slapdash in the task of thanking and welcoming new donors, according to a study by fundraising agency DMS.
The agency sent a £15 donation to 75 charities, only to find that three of the cheques had still not been cashed three months later.
Some charities took as long as 48 days to send thanks, although the average time was 15 days. A few of them responded more than once, and only one in 10 recognised whether a gift aid declaration had been made.
DMS said up to half of new donors never give again: "There's considerable evidence that the way charities respond to that first gift will have a substantial effect on future donations."