NS&I is also searching for an agency to handle its PR. Both pieces of business have been advertised in the Official Journal of the European Union. The deadline for initial submissions is 23 February.
The organisation said it was looking for agencies 'able to work in a collaborative environment', and so is willing to accept tenders both from single agencies and those working in partnership.
It offers its Premium Bonds and Inflation-Beating Savings products in Post Office branches and selected WH Smith stores.