A major review into rape convictions, ordered in the wake of last year's disclosure scandal, will only examine a fraction of the cases where a miscarriage of justice may have occurred, the Telegraph has learned.

The Criminal Cases Review Commission (CCRC) recently announced it would be revisiting 306 convictions on its books to identify if vital evidence had been missed during the original trial.

Concerns were raised about the safety of hundreds of rape convictions following the collapse of a series of high profile cases, when it emerged that the police and prosecutors had failed to disclose vital evidence that proved the defendant's innocence.

The vast amount of digital data, including text messages and photographs, that is now stored on mobile devices, means investigators have to spend many hours ensuring they have identified all the evidence that is relevant.

In December a judge halted the trial of student, Liam Allen, 22, after it emerged that his accuser had bombarded friends with hundreds of messages setting out her rape fantasies.