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NedS

I don't think it's really relevant what date HMRC pass the information to DWP - all that really matters is was the information available at ~1am on the morning after the AP ended when UC queried the data feed. Either the data was there (on CIS RTI) and can be used by UC for the AP that has just ended or it wasn't. The information is only queried by UC once per month, normally in the early hours of the morning immediately following the AP end date.

I'm assuming UC automatically triggers that query for every claim shortly after midnight immediately following the end of the AP (approx 8 million claims divided by 30 days per month = approx 267k queries per day, with two queries for a couple claim), and that query takes a few hours to run for all 267k claims, hence why we see it typically recorded in the early hours of the morning on each individual claim.