What are the unwritten rules you must learn to get a top job? Hashi Mohamed came to the UK aged nine, as an unaccompanied child refugee, with hardly any English. His academic achievements at school were far from stellar. Yet he now works as a barrister - and so is a member of one of the elite professions that have traditionally been very difficult for people from poor backgrounds to crack. So how did he do it? In a personal take on social mobility, we meet his mentors. These are the people who gave him a few lucky breaks and showed him how to fit in to a world he could barely imagine. But how many people can follow that path? And why should they have to?

Producer: Rosamund Jones

(Image: Hashi Mohamed. Credit: Shaista Chishty).

Has Front National leader Marine Le Pen really detoxified the party founded by her father 40 years ago? Is it a right-wing protest movement or a party seriously preparing for power? Anand Menon, professor of European politics at Kings College London, analyses the process the French call Dédiabolisation. Le Pen has banished the name of the party and even her own surname from election posters and leaflets. Her party is making inroads into socialist and communist fiefdoms in northern and eastern France. Combining nationalism with a message designed to reach out to the left, she speaks up loudly for the have-nots, people who live in the land she calls "the forgotten France." She targets trade unionists, teachers and gay voters. But widening the party's appeal leads to a tricky balancing act. Can Marine Le Pen manage the process of political exorcism without alienating die-hard supporters?

Why is liberal, tolerant Netherlands home to one of Europe's most successful anti-immigration, anti-Islamic parties?

Geert Wilders' radical right-wing Party For Freedom (PVV) - which wants to close mosques and ban the Qur'an - will be one of the biggest in the new Dutch parliament. So have its voters - whom Wilders once described as "Henk and Ingrid", Holland's Mr and Mrs Average - turned their backs on centuries-old Dutch values? Or do they just understand those values in a different way?

Unlike some far-right parties elsewhere in Europe, the PVV has no neo-Nazi roots. It's loud in its support for gay and women's rights. It promotes itself as a strong defender of Holland's Jewish community. Is its ideology just an opportunistic mishmash? Or does it make some sense in a Dutch context? Searching for Henk and Ingrid, Tim Whewell sets off through Dutch "flyover country" - the totally un-photogenic satellite towns and modern villages that tourists, and Holland's own elite, rarely see.

He asks if the PVV's platform is just thinly disguised racism. Or has it raised important questions about immigration and multiculturalism that other European countries, including the UK, have been scared to ask?

Producer: Helen Grady.

Could a second referendum on Scottish independence yield a different result? In September 2014 when Scotland voted against becoming an independent country it seemed like the question had been settled for the foreseeable future. All that changed on June 23rd 2016 when the UK voted to leave the EU. Just a few hours later - before she'd even been to bed - Scotland's First Minister Nicola Sturgeon was already talking about the prospect of another vote on independence. Ever since she has been ramping up the rhetoric. But what would the SNP's strategy be second time around?

BBC Scotland Editor Sarah Smith explores whether the SNP would dare call another vote when there seems little appetite and opinion polls have failed to move as much as Nicola Sturgeon might have expected following the Brexit vote. Sarah talks to strategists and politicians for an insight into how things might be different should a second referendum take place in the near future. She asks whether an independent Scotland would be accepted into the EU and what the future might hold for the first minister should she fail to achieve what she sees as her duty - offering Scotland another chance to gain independence.

Presenter: Sarah Smith

What makes us change our mind when it comes to elections? We are all swingers now. More voters than ever before are switching party from one election to the next. Tribal loyalties are weakening. The electorate is now willing to vote for the other side.

Professor Rosie Campbell from Birkbeck University finds out what prompts voters to shift from one party to another. Quentin Davies had been a Tory MP for decades when he crossed the floor of the house. He believes his views stayed the same - but the world changed around him. Journalist Janet Daley was once too left wing for the Labour Party - until Margaret Thatcher came along. Meanwhile Daryll Pitcher felt as though no party wanted his vote. Today he is a UKIP campaign manager.

Does age make us become more right wing? Have the main political parties alienated their core vote? And what does this mean for democracy?

Producer: Hannah Sander.

What does the story of the Downing Street cat reveal about the way voters decide? We are not taught how to vote. We rely on intuition, snap judgments and class prejudice. We vote for policies that clash wildly with our own views. We keep picking the same party rather than admit we were wrong in the past.

Rosie Campbell, Professor of Politics at Birkbeck University, sets out to become a rational voter. Class and religion have a huge impact. But our political views have become less polarised even as the parties have moved further apart. Rosie asks whether discussions of "left" and "right" have become irrelevant. In a neuropolitics lab Rosie undergoes tests to uncover her implicit biases. She learns that hope and anger make her want to vote - but blind her to the truth.

Producer: Hannah Sander.

Why do populist politicians across the West want warmer relations with Russia? Are they just Kremlin agents? Or are they tapping into a growing desire to find common cause with Moscow – and end East-West tension? Tim Whewell travels from Russia to America and across Europe to unravel the many different strands of pro-Moscow thinking, and offer a provocative analysis which challenges conventional thinking about the relationship between Russia and the West.

Donald Trump is just one of a new breed of Western politicians who want warmer relations with Vladimir Putin. Most Western experts say that’s dangerous: an aggressive Russia is plotting to divide and weaken the West. But Trump and others seem to have tapped into a popular desire to reduce tension and discover what Moscow and the West have in common. Could Moscow now lead a “Conservative International”, promoting traditional social values and national sovereignty around the world? On the right, some see Russia as a spiritual beacon. Others, both on the right and left, simply think the threat from the East is much exaggerated – and are warming to Russia as a protest against the Western establishment. Maybe it's time for a new way of understanding relations between the old superpowers.

When hiring people, is the concept of talent so ill-defined as to be useless? Entrepreneur and author Margaret Heffernan thinks so and explores what characteristics recruiters might want to look for instead. She argues that we need something new, as good grades and top degrees have proved no guarantee of high performance in the workplace. She talks to the recent head of HR (or "people operations") at Google, the pioneer of the concept of a "growth mindset", and the academic who found people's intelligence increased over the course of the 20th century. She also hears about other measures like "grit", "cultural fit" and how to interview people to find the candidate who is best for the job and the company, rather than the one you like.

Jacqui Smith, the former Labour home secretary, investigates why government policies fail, focusing on one of her party's most cherished reforms.

Indeterminate sentences for public protection (IPPs) were devised by David Blunkett and the Home Office to reassure voters that those convicted of serious violent and sexual offences would stay in prison until they could show by their changed behaviour that they could safely be released.

But much larger numbers of offenders received the sentences than had been expected and, as the prison population rose, jails struggled to provide the facilities IPP prisoners needed to show that they had reformed. The new sentencing structure, first passed in 2003, had to be drastically changed by Labour in 2008 and finally to be repealed by the coalition four years after that.

Jacqui Smith discovers the reasons why the change in sentencing was embarked upon, why its potential flaws weren't detected before its introduction and why the policy was maintained even as problems mounted. She considers the difficult legacy of IPPs - for those still in prison and for politicians devising shiny new initiatives in other fields of government.

Among those taking part: David Blunkett, Kenneth Clarke, Lord Judge, Professor Nick Hardwick.

Producer: Simon Coates.

The journey of an American 'cold warrior' from nuclear deterrence to nuclear disarmament. Former US Secretary of Defence William J Perry has spent his entire seven-decade career on the nuclear brink. A brilliant mathematician, he became involved in the development of weapons-related technology in the aftermath of World War II. As an analyst working at the heart of the Cuban Missile Crisis, he thought each day could be "my last day on earth." He was undersecretary for defence under President Carter in the 1970s, and secretary for defence under President Clinton in the 1990s. He arranged the dismantling of thousands of nuclear weapons in former Soviet republics after the collapse of the USSR, used strategic diplomacy with nuclear nations to prevent escalation, and argued - unsuccessfully - against the NATO expansion that Russia continues to find so threatening.

Now Secretary Perry is worried. Very worried. President Trump and President Putin are both ramping up their bellicose rhetoric. Mr Perry sees an increasing risk of nuclear conflagration in South Asia and the Korean peninsula, and in the face of an on-going terrorism threat, he is concerned unsecured nuclear materials could fall into the wrong hands.

"Today, the danger of some sort of nuclear catastrophe is greater than it was during the Cold War and most people are blissfully unaware of this danger," he argues.

What can be done? In a challenging interview with Edward Stourton, Secretary Perry reflects on the nuclear nightmare, and lays out his formula for nuclear security in our changing world.

Producer: Linda Pressly

(Image: Dr William Perry gives a lecture at Stanford University about the history of nuclear weapons. Credit: Light at 11b).