Tonight's TV highlights

Food 8pm, Channel 4 The Observer's food critic Jay Rayner, chef Ravinder Bhogal and The Sex Education Show's Anna Richardson continue on their mission to make us question where our food comes from and the wider impact of what we choose to put in our mouths. There are investigations into imported dairy, the ethics of the fish industry, the salt content of soups and a look at the science of food decay. It's all smartly done, and without the finger-wagging that can sometimes happen in such shows. Castle 9pm, Alibi This US comedy-drama series reunites us with Richard Castle. If you went only on his suit, you'd have him down as an estate agent. In fact, he's a successful writer of detective mysteries, who bases his books on periods spent "embedded" with the NYPD, particularly the waspish Detective Beckett. She wants rid of his cheeky remarks and, to be honest, you see her point. Still, as this second series begins, crime is cheekily solved – though the tone occasionally makes you wonder if you've entered some world where murder is, hey, sort of funny. Britain's Youngest Boarders 9pm, BBC2 More from the schools season on BBC2: here we follow the progress of three new boarders during their first term at boys' prep, Sunningdale. We witness the newbies' predictable normalisation to an environment where they have two hours of free time a day and are expected to roll off the names of Greek gods and their job descriptions at will. There are no quibbles about the merits of boarding for the little darlings of Britain's posh and privileged here, but the refined accents do belie the tender ages of boys who are expected to go on to thrive at the likes of Eton, Harrow and Rugby. Michael Wood's Story Of England 9pm, BBC4 Is it possible to tell the story of England and its people through the development of one community? If it's not, Michael Wood's in trouble because that's precisely what he tries to do by focusing on the village of Kibworth in Leicestershire. He begins by getting locals to dig pits in their gardens, excavations that yield pottery dating back to the Roman and Anglo-Saxon eras. While the villagers get their trowels out, a team equipped with a magnetometer, which helps to map archaeological features, surveys a dull-looking field to discover further evidence of Roman occupation. Seven Days 10pm, Channel 4 With Big Brother disappearing in the rear-view mirror, Channel 4 picks up a reality documentary series set in Notting Hill, west London – like the film but with some actual black people. It's the previous week in the lives of locals, both rich and poor, including an aspiring actress, Aldo Zilli's daughter, a pet nutritionist, a rapper and Rex from Big Brother's dad. No preview discs as it's fast turnaround stuff. But the involvement of Fergus O'Brien, who made BBC2's The Armstrongs, guarantees quality. Jimi Hendrix: Voodoo Child 10.45pm, BBC4 It is 40 years since his death, and no guitarist has matched Jimi Hendrix for his combination of virtuosity and raw excitement. Bootsy Collins narrates this documentary on Hendrix's short life and even shorter rock-star career, which essentially lasted from his arrival in Britain in 1966 to his death in 1970. Bob Smeaton's film looks at everything that led up to it, including his quiet Seattle childhood, his stint in the army and his years as a backing guitarist for R&B acts from the Isley Brothers to Little Richard. • This preview was amended on September 23 2010. The original referred to "The late Bootsy Collins". This has been corrected.