A former Cambridge Analytica director has confirmed that the firm pitched “a very detailed strategy” to Leave.EU on how it could use data and psychological profiling to microtarget people likely to back Brexit in the referendum.

In her first broadcast interview since coming forward last month to the Guardian, Brittany Kaiser said she carried out a study for Leave.EU before the referendum as part of her role in business development for Cambridge Analytica.

But speaking to BBC Radio 4’s Today programme, she said: “Cambridge Analytica never took receipt of any data or undertook any modelling on behalf of Leave.EU.”

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Kaiser, who appeared on a panel at Leave.EU’s launch event, is due to appear later on Tuesday before the culture select committee’s inquiry into fake news and misinformation.

Cambridge Analytica insists it did not work at all on the EU referendum, but admits pitching to Leave.EU, Vote Leave and the remain campaign. In her interview for Today, Kaiser gave details of the pitch to Leave.EU.

She said: “The proposal for how we were going to assist the Leave.EU campaign was to undertake the same type of research that we were undertaking in the United States. That’s psychographic research: understanding people’s personality profiles in order to develop different clusters of individuals – how they saw the world, why they would or wouldn’t be interested in the United Kingdom leaving the European Union and therefore crafting many different communications campaigns.”

Kaiser added: “The majority of the campaign that was undertaken by Cambridge Analytica was a pitch and a proposal. We put together a very detailed strategy on how they could match, combine and model data sets in order to find these target audiences to communicate to.”

She also revealed she would be submitting to the committee a Cambridge Analytica campaign portfolio on the work the firm did in Nigeria, after the Guardian and Observer uncovered a murky operation by suspected Israeli hackers to obtain the private emails of the Nigerian president, Muhammadu Buhari.

Asked why she left the company earlier this year, Kaiser said she had been denied promotion. “I left Cambridge Analytica full-time at the end of January because I was interested in other pursuits. I was also not very valued by the executives at that company. No matter how many times I asked to be a part of upper management of the firm I was denied. I left the company of my own accord. They tried to keep me on with an offer that wasn’t very interesting for me.”

Richard Tice, a co-founder of Leave.EU, told Today that Kaiser’s interview confirmed that Cambridge Analytica did no work for the campaign. It quoted him saying: “They only made a pitch and a proposal and received no data or undertook any modelling for Leave.EU.”