Our payment terms and practices

Payment terms will be agreed with suppliers prior to contract award. These terms will be included within the official purchase order documentation. We create a unique Purchase Order for all ordered goods or services. Our suppliers must be in receipt of a valid Purchase Order number before providing the goods and services. Failure to comply will result in non-payment. 

A purchase order is not required where payment has been made using a purchasing card. 

It is our policy to pay all suppliers in accordance with agreed terms. 

We require: 

  • Accurate and timely invoices 
  • A valid Purchase Order number 

Suppliers should send invoices to the Scottish Accounting Unit at: 
NATS Limited 
2nd Floor 
65 Haymarket Terrace 
EH12 5HD 

We will inform suppliers promptly when invoices are contested. Any complaints from suppliers regarding non-payment will be dealt with in an effective and timely manner. 

Invoice/Billing enquiries 

For invoice/billing enquiries please contact: PLServices@nats.co.uk (tel: 0131 527 3001) 

Electronic Trading

NATS is transitioning away from paper-based and manually transmitted documents to a paperless eProcurement process and transacting electronically through the Ariba eProcurement system will become a standard part of doing business with NATS.  We have partnered with SAP Ariba, to transact business electronically through the Ariba® Network.  Please click here for more detailed information on the Ariba Network. 

Benefits of E-Commerce and the Ariba Network 

Doing business with us electronically offers our suppliers several benefits, including: - 

  • Process streamlining results in reduced admin burden; 
  • Paperless process delivers time, cost and environmental efficiencies; 
  • Opportunity for suppliers to join the wider Ariba Network for exposure to all buying organisations within the network if they switch to Full Account; 
  • Simple set-up – all that is required is an Internet connection. 


Prompt Payment Code

We support the principles of the Prompt Payment Code (PPC) which sets standards for payment practices and best practice and is administered by the Chartered Institute of Credit Management. Compliance with the principles of the Code is monitored and enforced by the Prompt Payment Code Compliance Board. The Code covers prompt payment as well as wider payment procedures 


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