Labour is intensifying its demands for an inquiry into the activities of the Conservative party’s co-chair after claims that he ran a secretive club for top donors and blurred his business and political interests. Pressure has been growing on Ben Elliot after Tory donor Mohamed Amersi claimed the party co-chair had benefited from introducing him to the Prince of Wales in 2013. The introduction came after Amersi paid thousands to Quintessentially, Elliot’s luxury concierge company. Elliot has said the introduction was all about raising money for charity. Elliot has also been accused of running a secretive “advisory board” of donors, some paying £250,000, who had access to meetings with the prime minister and chancellor, Rishi Sunak. There have also been claims that Elliot – the nephew of the Duchess of Cornwall – retains links to a PR firm he co-founded that has lobbied the government on behalf of sub-prime lender Amigo and Chinese telecoms company Huawei. Elliot co-founded the PR firm Hawthorn Advisors in 2013 and continues to hold a minority stake through a trust, although he adopted an arm’s-length approach to his shareholding and stood down as a director in April last year. Sources have said he never took an active role and was simply an investor. This weekend, Labour wrote to the committee on standards in public life asking it to examine whether his behaviour conforms “with the ethical standards promoted” by the body. It wants to know if ministers met with the “advisory board” and what was discussed with them. The committee responded by suggesting thatit was unable to examine individual cases. However, Anneliese Dodds, the Labour chair, said Elliot should not “keep ducking scrutiny over his activities as co-chair of the Conservative party”. She added: “It was Boris Johnson who appointed him to that post – so responsibility for Elliot’s actions ultimately falls on the prime minister. Whether Boris Johnson admits it or not, he’s created a ‘cash for access’ culture in the Conservative party that is dragging our politics into the gutter. The longer the prime minister stays quiet, the more obvious it becomes that there is one rule for senior Conservatives and their chums, and another rule for everyone else.” The Conservative party did not respond to requests for comment, but has previously stated that policy “is in no way influenced by the donations the party receives – they are entirely separate”.