Since changing my twitter.txt to report both hourly rainfall and day total so far, I noticed a discrepancy last night. Tweet for 2100 UTC:
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2100 UTC: Wind N 0.0 kts. Temp 17.1 C (max 09-09 21.8 C at 13:54, min 09-09 16.4 C at 09:00), Dew pt 15.7 C. Bar 1015.31 hPa, Rising slowly. Rain last hour 0.0 mm (rain 09-09 1.4 mm) #ukweather
Tweet for 2200 UTC last night:
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2200 UTC: Wind N 0.0 kts. Temp 17.0 C (max 09-09 21.8 C at 13:54, min 09-09 16.4 C at 09:00), Dew pt 15.9 C. Bar 1015.41 hPa, Rising slowly. Rain last hour 1.2 mm (rain 09-09 2.8 mm) #ukweather
You can see that there was 1.2 mm of rain (rain last hour 2100-2200) but the daily total changed from 1.4 mm to 2.8 mm. Looking at the rainfall graph, there was a "tip" between 2100 and 2101. It looks as if the tip was not attributed to the hourly total at 2200 UTC, and was in effect lost. Daily total was correct at both 2100 UTC and 2200 UTC.