If you are buying the goods as a VAT registered company then there will be no VAT charged by the supplier and will be accountable on your VAT return as acquisition tax.
If you are not VAT registered then the supplier will have to charge you VAT,this could be EU VAT or UK VAT depending on where they are VAT registered.
Please see the guidance below:
Northern Ireland acquisition of goods from an EU member state
Supplies to customers (including private individuals) who are not registered for VAT