Angela Rayner's speech to a group of Labour activists on Tuesday night was arch, barbed, punchy and unflinching. Delivered by the former deputy prime minister in a room at a Westminster pub, this was a 1,500 word scripted and rather devastating critique of Sir Keir Starmer's leadership, albeit without naming him. The speech reads like a cry of frustration from a senior Labour figure who feels underwhelmed by what she sees as the party's underpowered performance in office. It was not quite a manifesto, but was definitely an alternative vision for how Labour could govern and will reignite speculation that she is preparing to challenge Sir Keir for the top job. Rayner was at her sharpest, certainly in terms of how Downing Street will see it, in four words in her conclusion. Labour is, she claimed, "running out of time". Quite the thing to say less than two years on from a landslide general election victory.…