I need a database of contacts; email address's, address's and phone no.s

I need the contact details, address, telephone number and email address's of the following types of companies in the UK:

Care homes, domiciliary home care companies, day centres for the elderly, day centres for learning difficulties and health care companies.

I want to use this information to contact companies via email and through the post. I also need an introductory letter written to introduce our new company and website to these companies and explain what we can do for them.