I need a list of business around St James & Green Park London

I am looking for someone to create a lit of business and offices around the St James & Green Park areas of London. We're looking for mainly offices & business such as hedge funds, recruitment firms, investment companies, and other business.

I'm looking for an email address, post address, and hopefully contact details of HR departments.

I will do the marketing and contacting, I just need the data.

I run a fitness company, and we offer a number of wellbeing solutions to companies. I'm looking to target/market a certain area with details of our offering.