The latest mini-scandal to hit Wikipedia is that the National Portrait Gallery is beginning legal proceedings against the online encyclopaedia.

The gallery says 3000 images from its website have been uploaded unofficially to Wikipedia by a member of the public and without permission.

A spokesperson for the gallery told The Evening Standard: "In March 2009 over 3000 high-resolution files were appropriated from the National Portrait Gallery website and published on Wikipedia without permission".

"The Gallery is very concerned that potential loss of licensing income from the high-resolution files threatens its ability to reinvest in its digitisation programme and so make further images available".

The spokesperson has said that legal proceedings have begun after no-one at Wikipedia responded to their complaints.

"To date, Wikipedia has not responded to our requests to discuss the issue and so the National Portrait Gallery has been obliged to issue a lawyer's letter".