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"?
Margaret Cabourn-Smith: Margaret Alice Cabourn-Smith (born July 25, 1975 in Richmond upon Thames) is an English comedy actress with appearances on "Catastrophe", "The IT Crowd", "Psychoville," "Peep Show" and "Fresh Meat". Catastrophe (2015 TV series):  It stars Sharon Horgan as Sharon Morris and Rob Delaney as Rob Norris, who get together after she becomes pregnant following a brief affair while he is in the UK on business.
Sharon Morris