Since 2018, UK law permits specialist doctors to prescribe cannabis-based...

https://www.tntmagazine.com/leisure-entertainment/leisure/why-is-cannabis-still-illegal-in-the-uk-the-history-behind-medical-cannabis-law/

Since 2018, UK law permits specialist doctors to prescribe cannabis-based medicines classified under Schedule 2, including Sativex and Epidyolex, despite cannabis remaining a Class B drug