what does mp mean in peaky blinders

The “MP” in Peaky Blinders stands for Member of Parliament – it’s a political title, not a gang rank or slang. In the show’s later seasons, Tommy Shelby moves from being just a gang leader to also becoming an elected politician in the British Parliament, so characters and captions refer to him as “Tommy Shelby, MP.” This simply means he’s an elected representative in the House of Commons, which fits with the story’s shift into politics and power beyond the streets of Birmingham.