The Charity Commission has appointed an interim manager to the Revelation Foundation, which runs Revelation TV.

An investigation into Revelation, whose founders are Howard and Lesley Conder, was launched last September after concerns were expressed about trustee benefits, conflicts of interest and a "potential significant loss of charitable funds". The charity had been the subject of complaints from members of the public that it was being used for "private advantage".

According to the Charity Commission, the appointment of Brian Johnson of HW Fisher & Company is a "temporary and protective measure and is not to the exclusion of the charity's trustees".

Johnson will conduct a review of the charity's governance, including its financial polices and accounts and its model of operations – it is based in Cheshire but broadcasts from Spain.

A statement from Revelation said: "After a thorough investigation of Revelation Foundation over nine months the Charity Commission has identified no loss or misappropriation of charitable funds by the trustees. The day to day operations of Revelation Foundation have continued throughout, without interference from the Charity Commission and no criticism has been made of programme content or production."

It said of Johnson's appointment: "The trustees have nothing to hide and welcome this appointment and will draw upon the expertise of the accountant and his team to ensure the public have full assurance as to the work of the trust."

Revelation's accounts for 2013 show an income of £1.7m, according to the Charity Commission's online register, with five employees and 20 volunteers.