Chancellor Rachel Reeves' attempt to intervene in a landmark case over controversial car loans has been blocked by the UK's highest court. The Supreme Court case, which is set for April, will hear an appeal by finance firms after the Court of Appeal ruled that it was unlawful for lenders to pay a commission to a dealer without a customer's consent.

The UK’s Supreme Court refused to let the Treasury intervene in a landmark court case over controversial car loans, dealing a blow to Chancellor Rachel Reeves who had sought to argue that the suit was hindering Britain’s regulatory environment.