Retained EU Law (Revocation and Reform) Bill

I am very grateful to the Minister for the skill with which he is trying to explain to a layman like me abstruse points of law. Could he give us a worked example, please? I was struck by what the noble and learned Lord, Lord Etherton, said about the potential cost to the country of a loss of clarity. Take his example of the copyright law of the United Kingdom, which, he said, was virtually exclusively based on EU law. What changes of circumstances do the Government envisage that the courts should be considering when they consider cases that are tried under the present British copyright law? The only change of circumstances I can think of is if the Government were to pass new legislation on copyright. I do not think that is the plan, but if they do not, what are the courts supposed to do? What change of circumstances would they have to consider?