Factbox - How will Brexit Britain untangle its legal ties with the EU?

LONDON (Reuters) - Britain published on Thursday the key piece of legislation that will enact its exit from the European Union, detailing how the government will transpose EU law into British law and end the supremacy of the European Court of Justice.

The legislation was presented to parliament without discussion in the first stage of what is expected to be a long and divisive debate about the nature of Britain's EU exit, during which the contents of the bill can be amended.