A new study into the racial bias faced by black, Asian and minorities in Britain shows the gulf in how people are treated in their daily lives.

A survey for the Guardian of 1,000 people from minority ethnic backgrounds found they were consistently more likely to have faced negative everyday experiences – all frequently associated with racism – than white people in a comparison poll.

The survey found that 43% of those from a minority ethnic background had been overlooked for a work promotion in a way that felt unfair in the last five years – more than twice the proportion of white people (18%) who reported the same experience.

The results show that ethnic minorities are three times as likely to have been thrown out of or denied entrance to a restaurant, bar or club in the last five years, and that more than two-thirds believe Britain has a problem with racism.

The ICM poll, commissioned to launch a week-long investigation into bias in Britain, focuses on everyday experiences of prejudice that could be a result of unconscious bias – quick decisions conditioned by our backgrounds, cultural environment and personal experiences.

It is believed to be the first major piece of UK public polling to focus on ethnic minorities’ experiences of unconscious bias, and comes amid wider concerns about a shortage of research capturing the views of minority groups.

Deputy director from the Runnymede Trust Zubaida Haque tells the paper, “Racism and discrimination for BAME people and minority faith groups isn’t restricted to one area of life,”

“If you’re not welcome in a restaurant as a guest because of the colour of your skin, you’re unlikely to get a job in the restaurant for the same reason. Structural and institutional racism is difficult to identify or prove, but it has much more far-reaching effects on people’s life chances.”

Findings included:

• 38% of people from ethnic minorities said they had been wrongly suspected of shoplifting in the last five years, compared with 14% of white people, with black people and women in particular more likely to be wrongly suspected.

• Minorities were more than twice as likely to have encountered abuse or rudeness from a stranger in the last week.

• 53% of people from a minority background believed they had been treated differently because of their hair, clothes or appearance, compared with 29% of white people.

Half of the respondents from a minority background said they believed people sometimes did not realise they were treating them differently because of their ethnicity, suggesting unconscious bias, as well as more explicit and deliberate racism, has a major influence on the way millions of people who were born in the UK or moved here are treated.

As well as demonstrating how much more likely ethnic minorities are to report negative experiences that did not feature an explicitly racist element, the poll found that one in eight had heard racist language directed at them in the month before they were surveyed.

It also found troubling levels of concern about bias in the workplace, with 57% of minorities saying they felt they had to work harder to succeed in Britain because of their ethnicity, and 40% saying they earned less or had worse employment prospects for the same reason.

One in seven people from ethnic minorities said they had been treated as a potential shoplifter in the last month, against one in 25 white people.