Beachy Head and the OS National Grid

 The weather was amazing on Beachy Head and the views were fantastic. 

Whilst we were up there, I noticed a post with this carved into it: TV 5891 9538. It was the TV that foxed me. But it isn't unusual to find OS grid references in locations in the Lakes. It turns out that the letters that denote larger grid squares cover a massive area right out into the Atlantic and across the near continent and Scandinavia. See this. We only use the letters H, N, O, S and T. These first letter squares are 500km x 500km! TV only covers a sliver of the coast but it was this coincidence that made me think about it.