LRQA is a subsidiary of Lloyd’s Register Group which is originally a vessel assessment company. The LRQA subsidiary confirms that products meet the standards (mainly ISO 9000 standards) The quality mark sometimes also appears as LR (LRQA - Lloyd’s Register Quality Assurance) Click for a larger image, as can be seen in the following cover Click for cover's details
An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.