Thirty six murders and Two Immoral Earnings - that's how Sir Ludovic Kennedy sums up the half century he has spent fighting miscarriages of justice.

It's also the title of his latest book, which examines ten of the most high profile cases he's worked on over the years.

Sir Ludovic campaigned to overturn the convictions of the Guildford Four and the Birmingham Six; he also campaigned against the death penalty for Derek Bentley (the boy whose case inspired the film Let him Have it).

And, he's still campaigning: to reopen the cases of two Scots Guardsmen who were convicted of shooting dead an unarmed Catholic in Belfast.

The main problem with all the cases he's dealt with, he says, is our attitude towards confessions.

If the police bully a confession out of a suspect, the jury tends to believe it. And judges cannot bring themselves to admit the police may have misbehaved.

click here to watch Breakfast's interview in full with Sir Ludovic Kennedy

Ludovic Kennedy's book Thirty Six Murderers and Two Immoral Earnings is published today (July 4) by Profile Books at �16.99. ISBN 1 86197 354 3