Justice: A Citizen's Guide To The 21st Century (BBC4, 9pm) Documentary on the philosophy of justice.
The Science Of Pain & Pleasure with Michael Mosely (BBC1, 10.35pm) Documentary on the biological reasons for feeling pleasure and pain. Presented by Michael Mosely.
Posh & Posher: Why Public Schoolboys Run Britain (BBC2, 9pm) Documentary investigating why the UK's Prime Ministers have become public school educated since Tony Blair came to power, despite the fact state school educated PM's held office from 1964-1997.
JLC: Turning Japanese (Five, 9pm) Documentary series where Justin Lee Collins samples the extraordinary and fascinating Japanese culture.
Cannabis: What's The Harm? (BBC3, 9pm) Documentary on the controversial drug. Presented by actor James Alexandrou.
The Highest Court In The Land (BBC4, 9pm) Four judges reveal details of their work and decision-making.
Skins (E4, 10pm) Series 5 of the teenage drama, debuting the third generation of characters.
The Million Pound Drop Live (Channel 4, 10pm) Return of the high stake gameshow. Hosted by Davina McCall.