Direct Marketing Association - http://www.dma.org.uk
The Chartered Institute of Marketing - http://www.cim.co.uk
Suppliers of high quality direct mail lists
http://www.wegenerdm.co.uk
http://www.marketingfile.com
http://dbuk.dnb.com
UK Business Directories
http://www.kompass.co.uk
http://www.kellysearch.com
http://www.applegatedirectory.co.uk
DTI - http://www.dti.gov.uk
Companies House - http://www.companieshouse.gov.uk
Business Link - http://www.businesslink.gov.uk
Chambers of Commerce - http://www.chamberonline.co.uk