I think that is the point. I thought you were saying that people would have choice so what is the problem. Sorry if I misunderstood.
As I said in another thread further problems come for Northern Ireland as they will still be subject to the same food standards as the rest of Ireland (ie the EUs) and customs checks on behalf of the EU will take place on goods between two parts of the UK to ensure these standards are met and produce banned in the EU does not get into the single market.
Similarly chicken produce exported to the rest of the EU from the UK will need a certificate of origin or risk being subjected to additional border checks if this is not available. Problem is the UK government has already warned these certificates may not be available and exports could be rejected.
https://www.gov.uk/guidance/poultry-...-leaves-the-eu
The UK government will issue certificates, however they may not be available from 1 January 2021. You can either export poultry meat to the EU without a certificate or remove optional indications.
To do this you must remove all optional indications from any:
packaging
labelling
accompanying documentation
If you export without a certificate, your goods may be delayed or rejected at an EU border.
Still we hold all the cards so it will probably be all ok