If you deal with UK Government funders, then a new service mentioned in Civil Society might be of interest.
To quote the Civil Society article, ‘The Cabinet Office has launched a feedback process for charities who feel like government department funders are limiting their ability to campaign or are otherwise dissatisfied with a government contract they have been asked to sign.’
You can find out more using the link https://www.civilsociety.co.uk/news/cabinet-office-introduces-grant-funding-feedback-service-for-charities.html.