Question: Who did Sharon Horgan star as in  a British sitcom first broadcast on 19 January 2015, which had appearances from an English comedy actress who was also in "The IT Crowd", "Psychoville," "Peep Show" and "Fresh Meat"?
Sentence (from "Catastrophe (2015 TV series)"): Catastrophe is a British sitcom first broadcast on 19 January 2015 on Channel 4.
Relevant evidence: No