You mainly ship to B2B customers in the UK. How will the payment of customs duties be taken care of?

If you send parcels with the INCO term DAP, Billing Term DP (sender pays the costs) you, as a sender, will get the customs costs passed on from DPD (service on demand). If you choose INCO term DAP, Billing Term NP (receiver pays the costs) then your customer will have to pay the customs fees to DPD prior to delivery. Without payment of these costs within 5 days, DPD UK will not deliver the parcel and return it to you.