John McDonnell's Labour conference speech on business and tax avoidance

The video discusses the need to reform the Treasury to eliminate biases against regional investments and address climate change. It emphasizes the importance of ethical business practices and the need to tackle tax avoidance. The speaker proposes mobilizing shareholder power to ensure companies adhere to fair tax standards, highlighting the role of various institutions in this effort.

What is the significance of the fair tax mark standards mentioned in the text?

What warning is given to tax avoiders in the speech?