The backlog of 153,000 notifications could potentially have meant that thousands were wrongly allowed to remain in the country, the Chief Inspector of Borders and Immigration said.
The tip-offs were all reviewed by May this year, but Mr Vine said it must be an "ongoing priority" to make sure checks are carried out.
His team examined work at three UKBA offices in Sheffield, Beijing and Delhi.
More top news
Almost immediately after EDF announced it was ready to proceed with Hinkley C, the government announced it wasn't.
Mohammed Shakiel estimates that more than half of those he has pulled from the rubble of wrecked buildings are under five-years-old.
Hampshire dad-of-four lost two stone as he walked the equivalent of five marathons to catch all 142 British figures - and a bonus egg.