If you wish to transport or temporarily export commercial samples, trade fair or exhibition goods and professional equipment to countries between Britain and an EU country, you may need to apply and buy an Admission Temporaire or Temporary Admission (ATA) Carnet.
Using the ATA Carnet will mean you’ll not pay customs charges, and it should simplify clearing your goods through customs in exporting and importing countries.
You can see full details on the UK Government website here.