http://en.wikipedia.org/wiki/File:Matilda-Scorpion.jpg

This artistic work created by the United Kingdom Government is in the public domain.

This is because it is one of the following:

It is a photograph created by the United Kingdom Government and taken prior to 1 June 1957; or
It was commercially published prior to 1963; or
It is an artistic work other than a photograph or engraving (e.g. a painting) which was created by the United Kingdom Government prior to 1963.