Diamond Comics Distributors are not receiving new products from printers for distribution due to the ongoing COVID-19 pandemic. Products with a release date of April 1st or later will no longer be shipped to retailers indefinitely.
For the UK specifically, products that had a release date of March 25th or later will no longer be sent to retailers. For now, any comic-book stores that choose to remain open will only have their on hand stock to sell to customers.
This news comes after numerous comic-book companies, and Diamond themselves, have altered policies and procedures in response to COVID-19. Diamond recently announced that they would postpone Free Comic Book Day 2020 to the summer.
For more information see: https://www.diamondcomics.com/Home/1/1/3/597?articleID=241552