 Janner returned to Parliament ten years later, when he was elected at the 1945 general election as Labour MP for Leicester West, defeating Harold Nicolson the incumbent National Labour MP.When that constituency was abolished for the 1950 election, he was re-elected for the new Leicester North West constituency.He held that seat until he retired from the Commons at the 1970 general election, when his seat was held for Labour by his son Greville.