Starting Wednesday, visitors from within the European Union will need to acquire an electronic entry permit prior to entering the UK. This permit, referred to as the Electronic Visitor Authorization (EVA), will be available for purchase online at a cost of £10, or approximately 12 euros. However, from April 9 onward, the fee for the permit will increase to £16. This initiative aligns with the UK government’s aim to bolster immigration security by evaluating individuals prior to their arrival at the border.

Source: https://www.france24.com/en/live-news/20250402-uk-imposes-online-entry-permit-on-european-visitors