Clientplus:

...focuses on your current customers as opposed to prospects.

...is permission based, meaning the email will extend the business
   relationship (and importantly all recipients will be positive to email
   messages).

...is based on the largest B2B email address database in the UK (with
   all data regularly and carefully updated throughout the year).

...recognizes the need for every business to have the ability to contact
   their customers through all available channels.

...allows our clients to capitalise on the cost savings and increased
   profitability that current, accurate and compliant client emails can
   (and should) produce.

...Most importantly Clientplus gives our clients the ability to contact their
   customers faster, cheaper and more accurately than ever.

*short of buying your biggest competitor perhaps