In its strategy document, the UK Central Government say it aims to use electronic invoicing for all transactions. The UK Government will not mandate suppliers at this stage, but will look at ways to spread best practice, and will track progress with a view to taking action if required at a later date.

For UK businesses, particularly small and medium sized enterprises, to realise the full benefits of e-invoicing, the systems should be easy to install and use, and pricing is flexible enough to suit the needs of diverse businesses. Some UK E-invoicing providers have committed to looking at ways to improve interoperability and accessibility of e-invoicing for SMEs, through the Business Application Software Developers Association interoperability charter.

Source: https://www.gov.uk/government/news/information-economy-strategy-will-boost-growth-opportunities-for-digital-industries