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Data Sources

improvemydata.com uses a wide range of data in providing its data cleaning and data enhancement services. Please click on the images below for more information on a particular data source.

Postcode Address File (PAF)

The Postcode Address File (PAF) is a complete database of every address in the UK to which mail is delivered, together with its appropriate postcode. The database contains over 28 million addresses of consumers, businesses and other organisations. PAF is produced by the Royal Mail and is updated quarterly.

National Change of Address Update (NCOA Update)

Retaining existing customers is often more cost-effective than acquiring new ones. With NCOA Update you can maintain contact with your customers when they move home, saving cost and driving profit.

Gone Away Suppression File (GAS)

The GoneAway Suppression File from The Data Agency (formerly REaD UK), dates back to 1992. Using both public and private data sources the GAS file is a compiled list of individuals at addresses they are known to have moved from. In every case, each move out is qualified by a move in to ensure accuracy.


Purity from Acxiom is a goneaway file that aims to reduce the number of 'false goneaways'.

National Change of Address Suppress (NCOA Suppress)

The NCOA Suppress File is built exclusively from data sourced from the Redirection Service. It allows you to suppress or flag the records of customers or prospects who have moved house.

National Deceased Register

The Ark's National Deceased Register (NDR) is widely acknowledged to be the UKs most reliable and accurate deceased suppression file and is relied upon by the vast majority of the country's leading bureaux and data processors to ensure their databases are maintained to the very highest standards.


The Mortascreen database of deceased people allows you to remove them from your mailing lists and avoid unnecessary wastage of marketing resources, as well as preventing unnecessary distress for the bereaved.

The Bereavement Register (TBR)

Launched in 2000, The Bereavement Register was created to help prevent bereaved families from receiving direct mail after the death of their loved ones.

Mailing Preference Service (MPS)

The Mailing Preference Service (MPS) is a free service set up over 20 years ago and funded by the direct mail industry to enable consumers to have their names and home addresses in the UK removed from lists used by the industry.

Baby Mailing Preference Service (BMPS)

The Baby MPS was launched in May 2002. It enables parents who have suffered a miscarriage or bereavement of a baby in the first weeks of life to register their wish not to receive baby related mailings.

Telephone Preference Service (TPS)

The Telephone Preference Service (TPS) enables individuals to register their objection to receiving unsolicited sales and marketing telephone calls.


The OSIS file (Operator Services Information System) represents the most accurate and cost effective source for the appending of telephone numbers against names and addresses.

Callcredit Marketing Solutions work under license from BT to access the directory information database.

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