You should liaise directly with your carriers if you believe that you will be unable to provide the information they require. The carrier will be able to advise on the impact on movements between GB and NI and may recommend how best to mitigate that impact.
If you are shipping B2B, you should liaise with your carrier to understand whether they can support these shipments. Where they do, you will need to confirm any additional shipping requirements and if B2B shipping is supported on all carrier services you plan to use.
My carrier has advised they will cease support for shipments to NI from 30th September on the integration I am using. What should I do?
You will need to identify an alternative carrier integration for your traffic from 30th September. In some cases, carriers may have an alternative integration that you can use. In other cases, you may need to ship with an alternate carrier.