The original series was placed after joining my daughter and her Year 6 classes on their end of term walk from the school, all the way up to Nab End. Thanks to all the staff and kids for a great day out.
I'd recommend an OS map showing the footpaths (freely available on Bing Maps).
Please take as much care over finding & replacing the cache as I have in setting them up. Replace them in the same spot, along with any geo-stones or other hiding materials... Thanx 