I think your application will move now. It works for me. I called them when i hit 15 months. Next day LPP was cleared. Still waiting for ceremony invitation. I don’t think MP call works here but i could be wrong though.I spoke with an agent today regarding my application, actually two of agent.
The first one was not at all helpful he said my application is non routine and does not come under normal processing time.
But I called again and spoke to other agent she told me my application is not non-routine and have submitted an inquiry to look into my application including my daughter as it surpassed the processing time.
Does this inquiry help, i am planning to wait few days to hear back from them, if still no update then I’ll contact my local MP.