This is also provided in the Statement of Investment Principles.
http://content.tfl.gov.uk/statement-of-investment-principals-march-2019.pdf
In the report and accounts the relevant page covering stewardship and activism is pages 18 - 19
This gives details of voting at company meetings where this has been against management because of ESG issues. The specific issues themselves are discussed with the Trustees quarterly, but are not normally highlighted in public documents.
In 2018 the Fund produced its foundation report on sustainable investing:
http://content.tfl.gov.uk/foundation-report-on-sustainable-investing-2018.pdf