B2B Email Database for UK SMEs

I'm seeking a comprehensive B2B email database for my email marketing campaign targeting the UK market. This database should cover a wide spectrum of businesses, specifically:

- Small and medium-sized enterprises (SMEs)
- Large corporations
- Startups

The primary requirement is to have the email address of each business included in the database.

Ideal Skills and Experience:
- Proven experience in data sourcing and database management.
- Prior experience in B2B email database creation.
- Familiarity with UK business landscape.
- Strong understanding of email marketing compliance and best practices.

I am currently working on a project for a client that involves sending an email marketing campaign to B2B contacts in the UK. I need a well-targeted database with contacts categorized by industry, with an accuracy of over 90%.
By renting the database, I mean gaining access to an email marketing platform where we can directly handle the email distribution ourselves. Alternatively, if there is an option to purchase the database, I would appreciate a price offer – specifically for companies in the UK.

Thank you in advance for the information, and I look forward to your response!