The linked homepage for Catastrophe (2015) at UK Channel 4 https://www.channel4.com/programmes/catastrophe is broken (or content has been removed.)

I might suggest original production companies

• Avalon: https://avalonuk.com/shows/catastrophe/ -or-
• Merman: https://www.hellomerman.com/portfolio/catastrophe/

UPDATE: I went ahead and updated Merman Productions site (above) for "HOMEPAGE" on PRIMARY FACTS. Asking for feedback if this is correct—or let me know why it would be wrong. Hard to tell whether Avalon or Merman (IMDB also lists Birdbath) would be a primary "homepage." However either is better than the broken Channel 4 link is my thinking. And Merman has a deeper site on show details, with credits, review, awards, etc.