Tamzin Outhwaite plays a scam artist out of her depth in Final Demand

Innovation Nation will be a year-long search for the most useful invention.

And Tamzin Outhwaite stars in Final Demand, a drama where a bored accounts clerk decides to steal a few cheques for fun, but her actions rapidly escalate beyond her control.

The shows joins other high-profile series that the channel hopes will reiterate the channel's public service responsibilities as well as entertainment.

They include an ambitious natural history show, Human Senses.

The series is hosted by zoologist Nigel Marven, and examines how human senses have developed through evolution.

Welcome To Britain will also look at how society is changing in the face of increased immigration.

BBC One controller Lorraine Heggessey said: "BBC One has a role to play in expanding viewers' knowledge and in offering new ideas and thoughts.

The Murder Game - solve the crime, or become a victim

"Now that we've got a stronger foundation to the channel almost every day of the week, what we're trying to do is bring greater breadth and depth into every genre - including science and the arts.

This is a continuation of what we've been doing over the last 18 months, and viewers are now seeing the fruit of this strategy on-air."

The �270m spring and summer schedules will also include the launch of former controller Alan Yentob's arts series, Imagine.

The channels' drama highlights include State of Play, a thriller about a high-rising MP and an investigative journalist. It stars David Morrissey and John Simm.

Eyes Down is a comedy-drama starring Lily Savage actor Paul O'Grady as the manager of a Liverpool bingo hall.

Human Senses travels the world to see how humans have developed

Drop The Dead Donkey star Neil Pearson features in Trevor's World of Sport, about a decent sports agent to struggles to meet the demands of his egotistical clients.

The Murder Game is the channel's latest reality show, based around a team of amateur investigators who have to use forensics to solve a murder and win �25,000.

But they have to avoid being "despatched" by the killer before they find out their identity.

Other shows returning to BBC One this year include hairdressing drama Cutting It and the spy drama Spooks.

Dennis Waterman will play a TV policeman for the first time since The Sweeney ended 25 years ago.

The actor - who played Detective Sergeant George Carter in the ITV series - is to appear in pilot comedy drama New Tricks, alongside James Bolam and Alun Armstrong.

News satire Have I Got News For You is also returning for its 15th year - but without a permanent host.

Presenter Angus Deayton left the programme last year after revelations about his private life.