I uses a database which places them on the OS digital mapping on my laptop, I then check out the areas on Google Earth and see if they are viable. It's then a case of tramping along the river or canal in this case and checking what is there. Many are well hidden in the undergrowth. Streetview is no use unless they are near a road. I also map them on Google Maps.
You might want to check out http://spuduka.blogspot.co.uk/ as well
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Photo taken in Padworth, West Berkshire RG7, UK
Misplaced? Suggest new location