As you know, on exit day (without an agreement in place) the UK will be a third country as respects waste shipments to and from EU member states, and to and from EEA countries (the EU Waste Shipment Regulation is incorporated into the EEA Agreement, NB however, shipments to Norway were always regarded as an export).
DEFRA is working behind the scenes to continue current consents (under the EU Waste Shipment Regulation) beyond the exit day, subject to certain conditions being met.
DEFRA has now informed the Chemical Industries Association (CIA) on their latest enquiry, that (per the CIA email to members) “98% of existing consents under the EU Waste Shipments Regulation have attained agreement from EU member states to continue their validity if the UK withdraws from the EU without a deal. However, there will be additional administrative procedures to follow so please contact your regulator if you require clarification”.
Spain remains the only outstanding member state, and the CIA will continue to work with Government on resolving this issue. The CIA ask to be advised if Spain is of relevance to your waste streams and you have not already informed them, or DEFRA.
[my thanks to a client, for the above information, the understanding is “there were 557 consented exports as of November 2018. As of last week, all bar the 12 Spanish ones (including Gibraltar) have obtained agreement from the MS/CA”.]