Jeremy Corbyn refuses to say whether he would campaign for Leave or Remain

The transcript discusses the options available to the UK regarding its relationship with the EU. It outlines the benefits of remaining in the EU, such as trade relationships, customs union, and rights. The Prime Minister's role is to present these options to the British people and deliver the chosen option. The options include remaining in the EU with possible reforms or leaving under terms that protect jobs and living standards.

What is the significance of the customs union mentioned in the text?

What does the speaker imply about the choice that the British people will make?