The Prime Minister’s office is a small, unimpressive room in 10 Downing Street with miserable views and unexceptional furniture. Since moving in, Theresa May has spruced it up — but only a little. There is now a large glass meeting table; her predecessor preferred to chat on the sofas. She has also delved into the government art collection to retrieve two pictures of Oxford, where she honed her interest in politics and met Philip, her husband.