Guidance: Check if a phone call you've received from HMRC is genuine

Added information on research to understand customer experiences of making a tax code amendment or correction.

Added ‘Digital Products and Services ― research with businesses and agents’ section.

Added ‘VAT returns communications campaign ― research with businesses’ section.

A road hauliers survey will be carried out between August 2021 and 31 October 2021.You may get a telephone call from IFF Research to invite you to take part.

Added translation