I guess one way I could imagine it happening is if the effort to suppress the Quit India movement, instead of being successful and swiftly suppressed, instead blows up in the face of the British.
How?
There were only 216 desertions during the OTL Quit India Movement and the goodwill of the Indian army would be completely necessary for Congress to even begin a violent removal of the British. Furthermore, the Raj had 35.000 British troops in strategic reserve to support the 222.000 policemen tasked with containing the uprising. It could have been worse though. Say that the memo of Gandhi's Gujarat meeting isn't intercepted or the Madras CID doesn't seize the secret files outlining the entire uprising, then the Raj is far worse off and the QIM becomes a real pain to end.