European Union (Withdrawal) Bill

I hope that the noble and learned Lord and the Committee will permit me to intervene, because it is important to know how this is going to be interpreted. I do not see in these words anything about a proviso where the modification does or does not go to the substance of the directive. What my question had in mind was that, if you had a directive that has 10 provisions in it, for example, and if one of those was modified, or indeed nine of them, when it comes to the one provision that has not been modified, does one treat the proviso as applying or not applying? In other words, is that therefore modified retained EU law, which cannot be interpreted in accordance with retained case law?