1. Information Commissioner's Office (ICO) – UK Data Protection and Privacy Authority
Role: The ICO is the United Kingdom's independent authority for data protection, privacy and freedom of information. You can report concerns about misuse of personal data for marketing, unlawful direct marketing or other breaches of data protection law to the ICO.
Postal Address
Information Commissioner's Office
Wycliffe House
Water Lane
Wilmslow
Cheshire
SK9 5AF
United Kingdom
Telephone
ICO Helpline: 0303 123 1113 (general enquiries)
Casework enquiries: icocasework@ico.org.uk
2. Advertising Standards Authority (ASA) – UK Advertising Regulator
Role: The ASA regulates advertising across all media in the UK and enforces the UK Advertising Codes. You can report misleading, harmful, or fraudulent advertising, including in direct mail or online marketing.
Postal Address
Advertising Standards Authority (ASA)
Castle House
37-45 Paul Street
London
EC2A 4LS
United Kingdom
Telephone
General enquiries: 020 7492 2222
General enquiries: enquiries@asa.org.uk
Website
Note: The ASA does not accept complaints about advertising by direct email; advertising complaints must be submitted via the ASA's online complaint tool.
Action Fraud – UK National Reporting Centre for Fraud
Role: Action Fraud is the UK's national centre where you can report fraud, cybercrime and related scams. You can report incidents online or via telephone to receive guidance and a crime reference number.
Telephone
Action Fraud Helpline: 0300 123 2040
(UK number — check current service hours on official site)
Use online reporting forms; direct email is typically not provided for case reporting.
Postal Address
Action Fraud does not publish a standard consumer postal address for reports; reporting is done via a web portal or phone.
Citizens Advice – Consumer Advice and Trading Standards Referrals
Role: Citizens Advice offers free and confidential guidance on consumer rights, including scams and misleading marketing. It can refer relevant cases to local Trading Standards teams.
Telephone
Citizens Advice Consumer Helpline: 0808 223 1133
(freephone across UK)
Email / Webform
Advice is provided through the Citizens Advice web portal; use the online form for enquiries.
Postal Address
Local Citizens Advice offices vary by region; find your nearest office via the Citizens Advice website.
National Cyber Security Centre (NCSC) – UK Cyber Security Authority
Role: The NCSC provides guidance on identifying and responding to cyber threats, including phishing, scams and misuse of personal data obtained through cybercrime.
Postal Address
NCSC at GCHQ, The National Cyber Security Centre
Britannia House
Finchley Road
London
NW3 5HT
United Kingdom
Telephone
NCSC Main Enquiries: 020 7582 5100 (for general industry enquiries)
Use the guidance feedback form or specialist contact channels via the NCSC website.
Website
https://www.ncsc.gov.uk/Royal Mail – Scam Mail Guidance
Role: Royal Mail provides information on identifying suspicious postal mail and how to report scam mail. Reporting channels include online forms and customer service.
Telephone
Royal Mail Customer Service: 03457 740 740 (UK customer service)
Email / Reporting
Use the Royal Mail Scam Mail reporting forms online.
Postal Address
Royal Mail Group Ltd
100 Victoria Embankment
London
EC4Y 0HQ
United Kingdom
Trading Standards (via Citizens Advice)
Role: Trading Standards services investigate unfair trading practices, including misleading marketing and scams. Reports are made via Citizens Advice and passed to local Trading Standards teams.
Telephone
Refer via Citizens Advice Consumer Helpline: 0808 223 1133
Postal Address
Local Trading Standards offices operate within local authority structures; contact details are provided on referral.