A Labour frontbencher who railed against companies “exploiting” homeowners with costly “ground rent” charges went on to ask a series of questions in Parliament on behalf of one of the investment firms behind the scandal, The Telegraph can reveal.

Kate Osamor, the shadow international development secretary, submitted six questions drafted by a lobbying firm coordinating an industry campaign against a crackdown on leasehold costs imposed on flat owners.

The firm, Pagefield, said it was acting for Long Harbour, an investment firm that runs a “ground rent fund”. Pagefield’s representatives approached Ms Osamor, the MP for Edmonton in north London, for a meeting days before she submitted the questions on July 9.

The questions included one asking James Brokenshire, the Housing ­Secretary, if he had considered the ­“potential effect on the viability of the leasehold sector” of regulating ground rents or removing the costs altogether, as well as about the “implications” for the building of affordable homes and “the level of house building in each ­region”. The questions were all ­answered by a junior minister.

The Telegraph understands that Pagefield is coordinating a campaign on behalf of five firms in the leasehold sector, including Long Harbour.

It is running a parallel campaign for the same group of firms against government efforts to force them to replace cladding on their buildings that is similar to that used on Grenfell Tower.