A report by the Public Accounts Committee (PAC) has determined that the IT systems used by the Department for Environment, Food and Rural Affairs (Defra) are "outdated and difficult to use".
The report, Tackling Defra's ageing digital services, was ordered by the House of Commons.
PAC concluded that, while the department is making "good progress" in tackling its most urgent legacy systems, it does not have a long-term strategy for its "much-needed wider digital transformation".
The report highlighted how Defra's systems are used by a wide range of customers and are critical to the UK's trade, disease prevention, flood protection and air quality monitoring.
To these groups of customers, the report said, Defra's legacy IT systems feel outdated and difficult to use, often being reliant on paper forms or documents.
The department was found to handle around 14 million transactions every year that still involve paper forms making them "inefficient and expensive".
The PAC report said Defra should look long-term, past its current "business transformation", as it does not currently have a vision of how the transformed department and its organisations will operate.
The report made recommendations to the department on how to stabilise and improve its IT systems, and how to maintain their proficiency in the long term.
The first recommendation was that Defra should, within six months, identify the success factors behind the progress it has made in addressing issues within its legacy IT and share lessons with the Central Digital and Data Office (CDDO) and other departments.
Other recommendations include:
The report also encouraged the department to "strengthen its case for investment" by developing its analysis of the efficiency savings that could be achieved through modernising its systems and processes.
As well as this, PAC said Defra should write to it within a year with the results of this analysis and what action it plans to take as a result.
The final recommendation in the report was for the CDDO. The report said it should set out whether it is getting the traction needed from departments to achieve its missions and report annually thereafter on its progress and any difficulties in working with departments,