Our lawful basis for the processing of your personal data for this purpose is our legitimate interest to be able to develop the Services and to increase Our understanding of the markets and customers (Article 6(1)(f) GDPR). Wherever possible, we anonymise or aggregate data processed for this purpose. c) For the purposes of carrying out marketing campaigns we may process personal data including:

Contact details (such as name, e-mail address and phone number)
The lawful basis on which we process personal data for marketing purposes is either our legitimate interests in marketing our business (Article 6(1)(f) GDPR), or consent (Article 6(1)(a) GDPR) where we send marketing about third party products and services, as further described in section 5.
What is the lawful basis of the processing of my data? 
Our lawful basis for the processing of your personal data for this purpose is our legitimate interest to be able to develop the Services and to increase Our understanding of the markets and customers (Article 6(1)(f) GDPR). 