My annual review is not due till next year, so I was a bit shocked when I received a letter saying my case has been reviewed and the amount changed slightly and that’s the amount I will get until next review, which is in a few months! I didn’t ask for a review, do child maintenance service review cases randomly (in between annual reviews) or do they just review it if one of the parents asks? The letter doesn’t say anything, only says it has been reviewed? the payment went slightly up, but I’m finding it really strange that the payment changed a few months before the annual review?