Could be changed later but as there is so much else for the present Govnt to do I don't think a change in EU law re allergen (and full ingredients) listings on processed foods is likely to happen anytime soon.
...The bill will seek to do three things:
Repeal the European Communities Act 1972. This legislation provides legal authority for EU law to have effect as national law in the UK. This will no longer be the case after Brexit.
Bring all EU laws onto the UK books.
This means that laws and regulations made over the past 40 years while the UK was a member of the EU will continue to apply after Brexit.
Create powers to make secondary legislation.
Technical problems will arise as EU laws are put on the statute book.
For instance, many EU laws mention EU institutions in which the UK will no longer participate after Brexit, or mention “EU law” itself, which will not be part of the UK legal system after Brexit. There will not be time for Parliament to scrutinise every change, so the bill will give ministers some powers to make these changes by secondary legislation, which is subject to less scrutiny by MPs.
If the UK is leaving the EU, why is it keeping laws made by the EU?
EU law covers areas such as environmental regulation, workers’ rights, and the regulation of financial services.
Without the Great Repeal Bill, when the UK leaves the EU, all these rules and regulations would no longer have legal standing in the UK, creating a ‘black hole’ in the UK statute book and leading to uncertainty and confusion. By carrying EU laws over into UK law, the Government plans to provide for what David Davis, Secretary of State for Exiting the EU, calls ‘a calm and orderly exit’ from the EU, while giving the Government and Parliament time to review, amend or scrap these laws in future....