EXCLUSIVE: Look away now Keir Starmer . As the UK Prime Minister’s fragile Labour government is plunged into chaos, Channel 4 has chosen a good day to unveil first looks of Steven Moffat ‘s political drama Number 10 . The Sherlock co-creator has always been clear that he is not basing the Downing Street series on any particular PM, but it is certainly ramping up marketing at a timely moment. Pics show Rafe Spall as Prime Minister Harry Douglas, Katherine Kelly as Chief of Staff Frances Telford and Jenna Coleman as Deputy Chief of Staff Katie Flynn. Kelly is even joined by 10 Downing Street’s longest-serving resident, Larry the cat. Watch on Deadline Katherine Kelly as Frances Telford with Larry the cat. Number 10’s synopsis reads: “There’s a Prime Minister in the attic, a coffee bar in the basement, and a wallpapered labyrinth of romance, crisis and heartbreak in-between.…