I usually try and find nearby sites if I am going somewhere, say for instance a campsite.
The way I usually do it is to go to search for mines in the Landranger grid square my location is in, pick a mine that sounds like it might be close, then in the page for that mine select the option to show nearby mines. If the mine I've picked is not actually close I then select the furthest mine in the direction of my site then repeat the process until I become as centred as possible on my location.
Is this in fact the best way of doing it or is there a way of searching for mines around a central point, grid ref or postcode etc.?