image is a derivative work of the following images: File:British NationalGrid.svg licensed with Cc-by-sa-3.0 2010-07-08T20:06:31Z Nandhp 204x377 (80100
choice. This image is a derivative work of the following images: File:National_Grid_for_Great_Britain_with_central_meridian.png licensed with Cc-by-sa-3