Evidence of what? That an offence may have been committed? The leaflet speaks for itself. It is a clear breach of my rights as copyright owner under section 80 of the Copyrights, Designs and Patents Act (1988?) which is the civil matter. If I can make the case, however that that makes it a derivative work I will argue that it is therefore a statement of fact misrepresenting me or my position and could then fall under section 106 of RPA 1983.