This location is at the National Museum in Cardiff, a frequent location for filming of the Sarah Jane Adventures and Doctor Who, including Silence in the Library (2008)/Forest of the Dead (2008) and Planet of the Dead (2009).
Sarah Jane's outfit for the majority of this serial is reminiscent of the Third Doctor, with whom Sarah Jane originally traveled in Doctor Who (1963) in the 1970s.
[Link=tt_cl_i_8] who plays Mr Harding was previously in Doctor Who Frontios.