Hi Iain
Yes it is a very interesting site.Back when it started it was a mad rush by everyone to bag a first square,not so many left in England but plenty still to be taken our way due to the wild highland area.
Posted link couple of years back
search.php?keywords=geograph+website&terms=all&author=&sc=1&sf=all&sr=posts&sk=t&sd=d&st=0&ch=300&t=0&submit=Search