The share of the public saying they are certain to vote is at a new Audit high of 62%, 11 points higher than in the first Audit in 2004. The number saying they are interested in politics is seven points higher than in Audit 1 (57% vs 50%), knowledgeable about politics 10 points higher (52% vs 42%), and knowledgeable about Parliament 16 points higher (49% vs 33%).

But, compared to 2004, satisfaction with the system of governing Britain is down seven points (36% to 29%), and people’s sense of being able to bring about political change (our efficacy measure) is down three points (37% to 34%).

Compared to last year, certainty to vote is up three points to 62%, interest in politics four points to 57%, self-assessed knowledge of politics three points to 52%, knowledge of Parliament four points to 49%, and the number of people who have undertaken a political activity in the last year six points to 75%.

27% feel they have influence locally, up four points from last year. This is the highest score for this indicator in the Audit series.

This year saw some notable rises in political engagement among some traditionally less engaged groups, namely those in social class DE, BME respondents and women.

Among 18-24s, certainty to vote rose five points from last year to 44%, the highest in the Audit series. Compared to Audit 1 in 2004, it is 16 points higher.

18-24s’ knowledge of politics is also up since Audit 1 in 2004, by eleven points (28% to 39%), as is their interest in politics (by six points, 35% to 41%) and their sense of political efficacy (also by six points, 35% to 41%).

However, like the population overall, 18-24s are less satisfied with the system of governing Britain than they were at the start of the Audit series. 18-24s' satisfaction with the system of governing Britain has deteriorated by seven points since Audit 1 in 2004 (35% to 28%).

Only 14% of Scots say they are satisfied with the system of governing Britain, a decline of three points in a year and 22 points since the first Audit in 2004.

Compared to last year, interest in and self-assessed knowledge of politics are both up four points, to 62% and 56% respectively. But certainty to vote dropped 10 points, to 59%, below the Britain-wide average.

Compared to Audit 1 in 2004, certainty to vote is up five points, political interest 16 points and knowledge 25 points. But people’s sense of political efficacy is down nine points at 36%.

Overall support for the greater use of referendums stands at 58%, down three points in the last year.

Before the EU referendum (Audit 13 in 2016), this stood at 76%.

Overall, 31% think the system of governing is good at protecting minority rights. However, BME respondents are more likely than white respondents to think it is bad at doing this (40% compared to 31%).

For other functions, the numbers of people saying the system performs well are just 26% for ‘providing political parties that offer clear alternatives to each other’, 22% for ‘providing a stable government’ and ‘ensuring the views of most Britons are represented’, and 21% for ‘allowing ordinary people to get involved with politics’. The system is seen to be worst at ‘encouraging governments to take long-term decisions’: 17% think it does this.

As the most important factor in determining their vote, 32% said whether a party ‘can be trusted to keep its promises’, 30% that it ‘has policies I fully support’, 28% that it ‘represents the interests of people like me’ and 20% whether it ‘is the most competent’.

Among the functions of political parties, people rate parties most poorly for their capacity to provide a way for ordinary people to get involved with politics; just 16% think they are good at this.

Of ‘leave’ voters, 48% think political parties are bad at telling voters about the issues they feel are most important to Britain and how they will work to solve them, against 36% of ‘remainers’ saying the same.

50% say they were happy with the choice of political parties available to them at the June 2017 general election, 29% that there was more than one party that appealed to them at that election, and 37% that they are a strong supporter of a party.

74% of those who used them said the party leaders’ debates and political interviews were at least ‘fairly important’ in their decision-making, and 72% that they were influenced by face-to-face discussions or conversations with other people.

49% were aware of parties’ printed campaign publicity, but just 34% of them said it was important in deciding whether and for whom to vote, the lowest score for any of the sources of election news and information tested.

News or news programmes on TV or radio were the leading source of election-related news or information at the 2017 general election: at 69%, they had a reach 20 points beyond any other source.

48% of the public report having undertaken no form of online political engagement in the last year.

Age divides are stark: watching politically-related videos online was done by 43% of 18-34s but 15% of over-55s; visiting the social media account of a politician or political party by 29% of 18-34s but 12% of over-55s; sharing something politically-related online by 21% of 18-34s but 11% of over-55s.

55% think social media help broaden political debate by giving a voice to people who would not normally take part, and 40% that social media help break down barriers between voters and politicians and political parties.

But 49% think social media are making political debate more divisive, and 46% that it is making political debate more superficial.