Newsnight - 20/04/2010

Newsnight Science editor Susan Watts asks how robust the science is behind the decisions being made on restricting British airspace. Paul Mason examines each of the main parties' financial services policies, and Jeremy speaks live to Alistair Darling. We also have a live interview with SNP leader Alex Salmond - on the day his party released their manifesto. And we have the next instalment of Motorway Man, in which we weigh up the election odds with horse-racing pundit, John McCririck.