Details of local business HR/CSR leads

I run a mental health charity in Basingstoke (Hampshire, UK) and we are now looking to target local businesses/corporates with our fundraising messaging to try and generate sponsorship.

It would therefore be great to have details sourced of the key businesses with head offices or who are based in Basingstoke and surrounding Hampshire area and the contact details of their Corporate Social Responsibility (CSR) teams/HR Department/Management contacts who we could approach with our sponsorship letter.