Summer 2001. Tony Blair had just won a second thumping election victory, promising opportunity for all. The new census showed a nation losing its religion, more inclined to live alone and more ethnically diverse. The maximum temperature was a tepid 32°C in west London in late June, while the twin towers rose tall and proud as always over the New York skyline.

Twenty five years on, we wanted to look at how the UK has changed. Welcome to the first of a six-part report from a group of 35 specialists, exploring all of the key developments in the intervening period.

Martin Farr, Senior Lecturer in Contemporary British History, Newcastle University

2001: A Political Odyssey is one way of framing how Britain has changed in the first quarter of the 21st century. When that year arrived, it turned out to be rather less advanced than the world of moon bases and video calls that Arthur C. Clarke and Stanley Kubrick had imagined (even in 2026, the test launch for the latest moon rocket recently exploded on the launchpad).

Tony Blair’s Labour government had been re-elected in June 2001 in a second landslide, its last untarnished victory. By 2005 Labour would be mired in war, and coming to terms with a reduced – though still substantial – parliamentary majority on only 35% of the vote.

Populism was certainly a word in 2001, but its usage in Britain was rare – it derived from America, along with much else in our cultural life. In Britain, the same two parties had been in government since 1924, and power alternated between them. When in opposition, Labour or Conservative had only to wait for their next opportunity.

How has the UK changed since the start of the century? From Blair to Burnham, from the dotcom era to AI agents, time has certainly not stood still. In this six-part series, a team of some 35 experts look at everything from defence spending to species populations to the rise of populism to try and make sense of the intervening years.

The Britain of 2001 was much simpler – only one of the two legacy parties ever in office, their longevity lubricated by economic growth – though complications were in train. Devolution had become institutionalised three years earlier. Those who had advocated for self-government for Wales and Scotland did so for one of two reasons (Northern Ireland being a quite different matter).

Either they saw devolution as a staging post to independence, or they thought the opposite: that desire for independence could only be addressed by devolving – repatriating, as a nationalist might see it – powers from London to Cardiff and Edinburgh. Who was right? Too soon to say, but the First Ministers of both Scotland and Wales are nationalists who advocate independence for their nations.

In one very limited sense things actually got simpler. In 2001 Britain had for 28 years been part of the European Economic Community, which had become the European Community, and then the European Union. For those who supported Brexit, the implication of those changes in title were of more than semantic interest: they helped explain the vote to leave. Brexit wasn’t even a word in 2001, of course. “Eurosceptic” was the nearest equivalent, in consequence of Margaret Thatcher’s landmark 1988 Bruges speech, warning of the dangers of a “European super-state”. From such acorns do mighty oaks rise.

The simplification of not having to be part of the 27-country assemblage, however, is dwarfed by the complications spawned by Britain’s departure, not least politically. To effect withdrawal from the EU, a culture of party political insurgency developed, usually promulgated by – one might say requiring – a charismatic individual.

James Goldsmith’s Referendum Party came fourth at the 1997 general election, with nearly a million new voters. A million also voted for Nick Griffin’s almost explicitly racist British National Party in the 2009 local elections. Yet by the 2015 general election, Nigel Farage’s Ukip, effectively the successor to Goldsmith’s party, received almost 4 million votes. Both the Ukip and BNP votes collapsed later that year with the Conservative offer of an EU referendum; Goldsmith died, but Farage would be back.

Brexit was a process as much as an event, but there were several others that were epochal: the 2003 Iraq war and the 2010 political “expenses scandal” shattered much of what public trust remained in Westminster. The SNP winning power in Scotland in 2007 led to the 2014 independence referendum. The nationalists lost, but in doing so created national faultines that could no longer be ignored.

Most of all, the 2008 financial crash defined the period. Stagnant living standards provide fertile grounds for grievances – catnip to populists. And so, in part, the appeal of Alex Salmond and Nicola Sturgeon in Scotland, of Jeremy Corbyn and Farage, and now the Green party’s Zack Polanski; charismatic individuals that characterise an increasingly individualistic society (curious how – conventionally – tainted so many of them became).

The greatest complication is voter fragmentation. In the 1950s more than 90% of voters voted Labour or Conservative (more often than not for the same party as........

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