Random UC payment. What could it be?

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I’ve received a random universal credit payment of £255 and some change but it’s not on my Journal. It’s referenced dwp uc and I’ve received my payment for this month. I recieved the col of payment too. I am waiting for collect and pay child maintanance but not due until December and not the same amount but can’t imagine it’d be defences as uc. Does anyone have any idea whether there’s any other payments due? I can’t get through on the phones

Has there been a change of circumstances for example ill health, rent increase or whatever that might give rise to DWP owing you arrears?

The phone service on 0800 328 5644 is usually pretty good if you're OK to wait for a few minutes. Otherwise ask a question on your journal.