The UK Department for International Trade (and more precisely its Export Control Unit) published a note, on 23 August 2018, on “Guidance: exporting controlled goods if there’s no Brexit deal”.
This guidance is a sort of vademecum explaining to UK economic operators how keep trading controlled items if a (specific) deal is not reached between UK and the EU.
Items concerned are:
The notice informs that EU regulations on the export of civilian firearms, dual-use items and goods that may be used for torture or capital punishment would become UK regulations as retained EU law under the EU (Withdrawal) Act 2018.
For further details, please see: https://www.gov.uk/government/publications/exporting-controlled-goods-if-theres-no-brexit-deal/exporting-controlled-goods-if-theres-no-brexit-deal.