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Many walks have fine pubs (Walk 18)

If you have a mobile phone, carry it – signal strength is excellent almost everywhere, albeit with surprising exceptions. Smartphone users will usually find usable 3G signals, or better, and sometimes WiFi hotspots too.

Check the ‘refreshments’ line in the information box to each walk to decide what food to take with you – although a few snacks are always a good idea, and a bottle of water certainly is, especially in hot weather.

Maps

The extracts in this book are from Ordnance Survey Explorer maps at 1:25,000 scale. Coupled with the route descriptions, they should keep you on track. London as a whole is covered by sheets 146 and 147, 160 to 162, and 172 to 175.

The OS Landranger series, at 1:50,000 scale, is of less use in London, given how much needs to be packed in. London is covered by just two sheets, 176 and 177.

Street maps of London vary – some give more off-road detail than you might expect, but in general they won’t be using the National Grid that precisely defines start and finish points in this book.