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BBC MUNDO RADIO
The winner of the Sky News Leaders' Debate will be decided by who "looks and sounds" most like a Prime Minister, Sky's body language expert says.
Looking the part? Sky's body language expert Peter Collett says leaders must impress
All three leaders will need to learn from their experiences in the first debate to impress voters the second time round, Peter Collett said.
Mr Collett said Nick Clegg had come across best last week because he looked at the camera and addressed viewers at home.
Mr Cameron was the least effective of the three, Mr Collett said, mostly addressing the audience.
Mr Brown, meanwhile, had adopted the tactic of trying to marginalise the Tory leader by "courting Nick Clegg in public".
Peter Collett at the debate studio
Speaking ahead of tonight's historic debate Mr Collett said the leaders had everything to play for.
""What have the three leaders learned from the first debate?," he asked.
"Gordon Brown and David Cameron were less effective and they will be doing all they can to improve their performances.
"David Cameron is under a lot of pressure to up his game."
The body language expert added: "Unless one of them says something really memorable or makes a terrible gaffe, the outcome of the second debate is likely to be decided on how the three leaders come across - whether they look and sound like a Prime Minsiter."
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