Those travelling within the EU's 27 member states plus Norway, Iceland and Switzerland can take duty-free goods on connecting flights, provided they are in tamper-proof bags.

Hello, I'd like to apply for a duty paid proof of last year because we are going to attend an engineering project tender.

The modern duty of proof means that when allegation of fact in action can't be proved and emerge as uncertain truth, which side should undertake bad effect of action.