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According to a US Senate committee investigation in 2020, Arkady and Boris Rotenberg - judo partners of the Russian president - used a type of company to dodge anti-money laundering laws, it has been claimed.

These companies, known as English Limited Partnerships (ELPs), do not require their real owners to be identified and as thousands are being created, Britain's reputation is being called into question.

ELPs are legitimately used in real estate, investment, and pension funds - they have tax advantages, for example, and the amount investors risk is limited.

Successive governments have failed to deal with the issue and working with investigators from Finance Uncovered, we have discovered evidence that these companies were used to buy millions of dollars' worth of art.

Â鶹¹ÙÍøÊ×Ò³Èë¿Ú Economics Correspondent Andy Verity reports.