A spokesperson for the Parliamentary Works Directorate confirmed: "There are a lot of good stories to be told about its design, the engineering and the innovations. We felt we needed help to counteract some of the inaccurate stories that have appeared in the press."
The directorate selected Mortlake-based Tideway at the beginning of July after interviewing three firms recommended to it by media relations consultant John Stonborough.
The appointment pre-empts the topping out on Wednesday of the Sir Michael Hopkins & Partners-designed building.
The first salvo in the government's PR campaign was fired last Thursday by Sydney Chapman MP, chairman of the Accommodation and Works Select Committee that commissions financial and physical progress reports on projects in the parliamentary estate.
In a statement, Chapman set out a justification of the design choices and inflated cost of the project. He insisted that the £250m project, commissioned in 1992 with a budget of £165m, was "currently ahead of time and within budget". In a breakdown of the cost increase, he attributed £56m to inflation in the construction industry to 2001, £9m to the 11-month delay in handing over the site by London Underground, and £20m to "approved additional costs". These included using bronze as a cladding material to extend the life of the building, electronic door locks, internal security measures and the inclusion of the parliamentary data and video network, increased health and safety and new fire regulations.
Fit-out of the building started at the beginning of June. Pipes are being installed for the underfloor heating system. Plant and air-handling units will be installed in the roof, which will be sealed by the end of August.
The project is due to be completed in summer 2000.
While the debate about cost simmers away, the focus of the public's attention is now Sir Michael Hopkins and Partners' controversial design.