Hi Martin,
It works when i try it in browser but the same code doesn't work when you add it in your theme.
Maybe due to spacing issue, try removing paces and add whole code in one line. Try using the following code.
<div class="copyright"><p></p><div class="aligncenter"><?php echo 'Copyright © ' . date("Y") . ' ' . get_bloginfo('name'); ?>, all rights reserved | Charity number: 801523</div><div class="aligncenter">Theme derived from the <a href="<?php echo esc_url( __( 'http://wordpress.org/twentythirteen','twentythirteen' ) ); ?>" title="<?php esc_attr_e( 'Twenty Thirteen Theme', 'twentythirteen' ); ?>"><?php printf( __( '%s', 'twentythirteen' ), 'Twenty Thirteen' ); ?></a> | Reworked by: Martin Rowan</div><p></p></div>Regards,