> TfL owns the advertising spaces and maintains its own Advertising Policy, which sets stricter standards than general UK advertising rules (enforced by the Advertising Standards Authority, or ASA, and the Committees of Advertising Practice, CAP). All ads must comply with both the ASA/CAP codes and TfL's specific guidelines, which cover issues like offence, sexual content, violence, political advertising, health claims, and more (e.g., restrictions on high-fat/sugar/salt food ads since 2019).
Regarding the tube:
> TfL owns the advertising spaces and maintains its own Advertising Policy, which sets stricter standards than general UK advertising rules (enforced by the Advertising Standards Authority, or ASA, and the Committees of Advertising Practice, CAP). All ads must comply with both the ASA/CAP codes and TfL's specific guidelines, which cover issues like offence, sexual content, violence, political advertising, health claims, and more (e.g., restrictions on high-fat/sugar/salt food ads since 2019).