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Grid letters
#1
<![CDATA[<br>Source: Wikipedia article <a href="https://en.wikipedia.org/wiki/British_national_grid_reference_system#cite_ref-3">British national grid reference system</a>]]>
Grid digits
NN 166 712
<![CDATA[<br>Source: Wikipedia article <a href="https://en.wikipedia.org/wiki/British_national_grid_reference_system#Grid_digits">British national grid reference system</a>]]>
All-numeric grid references
HU396753
<![CDATA[<br>Source: Wikipedia article <a href="https://en.wikipedia.org/wiki/British_national_grid_reference_system#All-numeric_grid_references">British national grid reference system</a>]]>
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