Prime Minister David Cameron's official spokesman said:
The report raises legitimate concerns about the backlog of outstanding cases. We are aware of that problem. It is something we are already trying to tackle.
The report itself acknowledges that we have started to address some of these problems.
Asked whether there might be an amnesty for people in the backlog, the spokesman said: "That is not something we are considering."
More top news
Provost of Eton College threatens to quit the Tory party over suggestions job applicants should be quizzed about private education.
A dry night ahead, with any showers fading away.
Global warming and a strong El Nino weather system has sparked mass coral bleaching, experts warn.