The trials I was thinking about were relating to articles in the Guardian:
"The UK has led the world in testing Covid treatments
The UK Randomised Evaluation of Covid-19 Therapy (Recovery) organisation has become the world’s largest collaboration for trials on people in hospital with Covid-19, with more than 180 hospitals and about 40,000 hospital patients taking part so far."
"The trials have been hugely influential. By March 2021, dexamethasone, a cheap steroid, was estimated to have saved 22,000 lives in the UK and more than 1 million worldwide. " ... "Recovery trials also established things that did not show clear benefits, such as hydroxychloroquine and convalescent plasma"