"It shines a light onto previously hidden relationships, uncovering anomalies between such elements as bank interest, property income and lifestyle indicators before homing in on unexplained inconsistencies, " an HMRC spokesman said.
The rear notification light is rather uncommon to smartphones -- we can't recall having seen a device adorned with two such indicators -- but anyone who tends to put their phone face-down will actually find a great deal of use out of this addition.