Equidebt chairman Mr Mosiewicz said: "We are delighted that RLPE has become a majority shareholder in Equidebt.
Mr Mosiewicz said: "As a result of this transaction and our ongoing relationship with RLPE, we believe that Equidebt is now extremely well positioned to continue its growth."
RLPE say the level of unsecured loans had grown to pounds 189 billion in the UK, a rise of 63 per cent since 2000That level of debt, combined with financial organisations becoming more comfortable with the concept of selling distressed debt, meant debt collection and debt purchase markets were likely to grow.
RLPE has taken a majority stake in Equidebt, alongside founders Bob Scott and Jan Mosiewicz, with RLPE director Duncan Johnson joining the board as a non-executive director.
Legal advice to RLPE was provided by Jim Lavery of DLA Piper Ruddick Gray Cary.
Other Midlands-based participants to the deal were legal advisers to RLPE - Jim Lavery and Charlie Cook at DLA.
Mr Ormonde said: 'The support of RLPE will enable us to continue to take advantage of developments in the card payment market, particularly given the pressure on retailers to adopt chip-and-pin.