Is the UK's new drug the same as regeneron?
"Covid-19 news: UK approves first-of-its-kind antibody treatment | New Scientist" [newscientist.com]
Yes. It's the one given to Trump last year, developed by the companies Regeneron and Roche. It now has an official brand name, that's all.
However, other companies and labs are working on creating further artificial antibodies.
By the end of this year there could be quite a few, driving down prices I hope.