The Sky News programme, starting at 7pm tonight, will see the Tory and Labour leaders each questioned by Beth Rigby - and audience members - for 45 minutes.
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Paula Vennells began her questioning this morning with an apology, saying she was "very, very sorry". She is one of the most high-profile faces of the scandal, in which hundreds of sub-postmasters were wrongfully convicted. Watch her evidence live below.
A boy, 14, has died after a man with a sword went on a rampage near Hainault Tube station in northeast London. Two police officers also suffered significant injuries, with two other people taken to hospital. A 36-year-old has been arrested - he too is in hospital.