I think this article is poorly titled for the following reasons:
The title National Grid could also refer to a country's electric power distribution system, not maps, I would have thought.
The word map should be in the title.
Mapping co-ordinate systems is a travel topic that is general to the world. Having an article specific to one country may mean information common to all mapping reference systems is duplicated or lost.
Map references or Geographic co-ordinates may be better titles. Perhaps even Geospatial mapping systems or even simply Maps may be more informative and less obscure.