Build list of 500 leads

I would like to get a pipeline of leads for my company to sell services to. We sell Training & Development to companies, so I am looking for Head of Learning & Development / Head of HR / Head of People / COO or CEO.

I would like to have the work in a certain format including:

- Name
- Job title
- Company
- Company URL
- Tel
- email
- Employee size
- Location

I am looking for businesses with London HQs with more than 10 employees. No charities.