The report does acknowledge that one of these proposals - Mark Hines Architects' scheme for Save Britain's Heritage to place the chamber in the building's courtyard and convert the existing space into grade A offices - would be cheaper.
But it added: “While this looks promising on the surface, the compromises involved are very significant. A compromised chamber with a sub-standard solution on division lobbies, no committee rooms within the secure perimeter...Given the level to which facilities are compromised, it is unlikely that that this scheme is actually viable in terms of ensuring Parliament can continue to carry out its core functions.”