This BBC page gives a good overview of the issues.

https://www.bbc.co.uk/news/uk-44531112

A recent Guardian article discusses the current debate in the UK.

https://www.theguardian.com/society/2019/jun/10/a-bleak-prospect-why-legal-weed-in-britain-may-be-a-pipe-dream

The drug policy alliance website on legalisation in the US.

http://www.drugpolicy.org/issues/marijuana-legalization-and-regulation

The lawyer portal on the history of legislation and the prospects of legalisation.

https://www.thelawyerportal.com/blog/how-close-is-the-uk-to-legalising-cannabis/

More on legalisation in the US.

https://www.vox.com/policy-and-politics/2019/8/30/20826835/marijuana-legalization-medical-decriminalization-federal-vote